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<!--Date of creation: 09/17/2026-->
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:to="us-gaap_IntangibleAssetsNetExcludingGoodwill_lbl_984d85" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IntangibleAssetsNetExcludingGoodwill_lbl_984d85" xml:lang="en-US">Intangible assets, net</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsNoncurrent" xlink:to="us-gaap_AssetsNoncurrent_lbl_e0d3c8" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_AssetsNoncurrent_lbl_e0d3c8" xml:lang="en-US">Total non-current assets</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNoncurrent" xlink:label="us-gaap_AssetsNoncurrent" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsNoncurrent" xlink:to="us-gaap_AssetsNoncurrent_lbl_8" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsNoncurrent_lbl_8" xml:lang="en-US">[Assets, Noncurrent]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl_d492a7" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl_d492a7" xml:lang="en-US">Total Assets</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl_9" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_lbl_9" xml:lang="en-US">[Assets]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl_fc7c2e" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl_fc7c2e" xml:lang="en-US">Liabilities and Stockholders' Equity</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="us-gaap_LiabilitiesCurrentAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract_lbl_606f9c" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl_606f9c" xml:lang="en-US">Current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_AccountsPayableRelatedPartyCurrent" xlink:label="ctth_AccountsPayableRelatedPartyCurrent" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_AccountsPayableRelatedPartyCurrent" xlink:to="ctth_AccountsPayableRelatedPartyCurrent_lbl_737931" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_AccountsPayableRelatedPartyCurrent_lbl_737931" xml:lang="en-US">Related-party payables</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableCurrent" xlink:label="us-gaap_NotesPayableCurrent" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NotesPayableCurrent" xlink:to="us-gaap_NotesPayableCurrent_lbl_cb1c93" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NotesPayableCurrent_lbl_cb1c93" xml:lang="en-US">Related-party note payable</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl_d69096" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesCurrent_lbl_d69096" xml:lang="en-US">Total current liabilities</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent" xlink:label="us-gaap_LiabilitiesCurrent" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesCurrent" xlink:to="us-gaap_LiabilitiesCurrent_lbl_14" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesCurrent_lbl_14" xml:lang="en-US">[Liabilities, Current]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl_64a0bd" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl_64a0bd" xml:lang="en-US">Stockholders' equity</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue" xlink:label="us-gaap_PreferredStockValue" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockValue" xlink:to="us-gaap_PreferredStockValue_lbl_a788c7" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockValue_lbl_a788c7" xml:lang="en-US">Preferred stock, $0.0001 par value; 10,000,000 authorized; none issued and outstanding as of June 30, 2026 and December 31, 2025</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl_c5a781" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl_c5a781" xml:lang="en-US">Common stock, $0.0001 par value; 300,000,000 shares authorized; 59,722,232 and 58,837,232 issued and outstanding as of June 30, 2026 and December 31, 2025</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="us-gaap_AdditionalPaidInCapital" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapital" xlink:to="us-gaap_AdditionalPaidInCapital_lbl_85c90f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapital_lbl_85c90f" xml:lang="en-US">Additional paid-in-capital</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl_ea6fa0" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl_ea6fa0" xml:lang="en-US">Accumulated deficit</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl_43932b" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl_43932b" xml:lang="en-US">Total stockholders' equity</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl_20" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquity_lbl_20" xml:lang="en-US">[Equity, Attributable to Parent]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl_a9ba68" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl_a9ba68" xml:lang="en-US">Total liabilities and stockholders' equity</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl_21" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl_21" xml:lang="en-US">[Liabilities and Equity]</link:label>
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl_3007dd" xml:lang="en-US">Common stock, par value</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl_8887f6" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl_8887f6" xml:lang="en-US">Common stock, shares authorized</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl_da8f24" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl_da8f24" xml:lang="en-US">Common stock, shares issued</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl_e27201" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl_e27201" xml:lang="en-US">Common Stock, shares outstanding</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl_73ffb3" xml:lang="en-US">Preferred stock, par value</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="us-gaap_PreferredStockSharesAuthorized" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized_lbl_24c994" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl_24c994" xml:lang="en-US">Preferred stock, shares authorized</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="us-gaap_PreferredStockSharesIssued" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesIssued_lbl_66cdcd" xml:lang="en-US">Preferred stock, shares issued</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="us-gaap_PreferredStockSharesOutstanding" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl_5734eb" xml:lang="en-US">Preferred Stock, shares outstanding</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl_9004cb" xml:lang="en-US">Income Statements</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_lbl_8c040e" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpensesAbstract_lbl_8c040e" xml:lang="en-US">Operating expenses</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_ConsultingFees" xlink:label="ctth_ConsultingFees" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_ConsultingFees" xlink:to="ctth_ConsultingFees_lbl_acdd06" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_ConsultingFees_lbl_acdd06" xml:lang="en-US">Consulting fees</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="us-gaap_GeneralAndAdministrativeExpense" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeneralAndAdministrativeExpense" xlink:to="us-gaap_GeneralAndAdministrativeExpense_lbl_357de5" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl_357de5" xml:lang="en-US">General and administrative costs</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LegalFees" xlink:label="us-gaap_LegalFees" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LegalFees" xlink:to="us-gaap_LegalFees_lbl_0424d2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LegalFees_lbl_0424d2" xml:lang="en-US">Filing and legal costs</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpense" xlink:label="us-gaap_InterestExpense" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpense" xlink:to="us-gaap_InterestExpense_lbl_9a1333" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpense_lbl_9a1333" xml:lang="en-US">Interest expense</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_BankOperatingChargesExpenses" xlink:label="ctth_BankOperatingChargesExpenses" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_BankOperatingChargesExpenses_lbl_445547" xml:lang="en-US">Bank charges</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_TravelOperatingChargesExpenses" xlink:label="ctth_TravelOperatingChargesExpenses" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_TravelOperatingChargesExpenses" xlink:to="ctth_TravelOperatingChargesExpenses_lbl_00dd62" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_TravelOperatingChargesExpenses_lbl_00dd62" xml:lang="en-US">Travel</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_MealsChargesExpenses" xlink:label="ctth_MealsChargesExpenses" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_MealsChargesExpenses" xlink:to="ctth_MealsChargesExpenses_lbl_58a4d3" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_MealsChargesExpenses_lbl_58a4d3" xml:lang="en-US">Meals</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="us-gaap_MarketingAndAdvertisingExpense" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MarketingAndAdvertisingExpense" xlink:to="us-gaap_MarketingAndAdvertisingExpense_lbl_9e4502" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MarketingAndAdvertisingExpense_lbl_9e4502" xml:lang="en-US">Marketing and promotions</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="us-gaap_AmortizationOfIntangibleAssets" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_lbl_155f81" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl_155f81" xml:lang="en-US">Amortization expense</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl_ee4b0b" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingExpenses_lbl_ee4b0b" xml:lang="en-US">Total operating expenses</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses" xlink:label="us-gaap_OperatingExpenses" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl_12" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenses_lbl_12" xml:lang="en-US">[Operating Expenses]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl_7011d8" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl_7011d8" xml:lang="en-US">Net (loss)</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl_13" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_lbl_13" xml:lang="en-US">[Net Income (Loss) Attributable to Parent]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="us-gaap_EarningsPerShareDiluted" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_lbl_e3c1ec" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareDiluted_lbl_e3c1ec" xml:lang="en-US">Basic and diluted loss per share</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_lbl_e50780" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_lbl_e50780" xml:lang="en-US">Weighted average shares outstanding</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl_94cbd8" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl_94cbd8" xml:lang="en-US">Basic and diluted</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfStockholdersEquityAbstract" xlink:to="us-gaap_StatementOfStockholdersEquityAbstract_lbl_91e4ab" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl_91e4ab" xml:lang="en-US">Statements of Stockholders Equity</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl_bbd833" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl_bbd833" xml:lang="en-US">Statement [Table]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl_11a36a" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl_11a36a" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_StatementEquityComponentsAxis_lbl_e09d4b" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl_e09d4b" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockMember" xlink:to="us-gaap_CommonStockMember_lbl_c62799" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockMember_lbl_c62799" xml:lang="en-US">Common Stock</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember" xlink:label="us-gaap_TreasuryStockCommonMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TreasuryStockCommonMember" xlink:to="us-gaap_TreasuryStockCommonMember_lbl_e5b4ec" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TreasuryStockCommonMember_lbl_e5b4ec" xml:lang="en-US">Treasury Stock</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="us-gaap_AdditionalPaidInCapitalMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapitalMember" xlink:to="us-gaap_AdditionalPaidInCapitalMember_lbl_e346c6" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl_e346c6" xml:lang="en-US">Additional Paid-In Capital</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember" xlink:label="us-gaap_RetainedEarningsMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsMember" xlink:to="us-gaap_RetainedEarningsMember_lbl_ae9fff" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsMember_lbl_ae9fff" xml:lang="en-US">Accumulated Deficit</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssued" xlink:to="us-gaap_SharesIssued_lbl_5c713f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_SharesIssued_lbl_5c713f" xml:lang="en-US">Balance, shares</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued" xlink:label="us-gaap_SharesIssued" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssued" xlink:to="us-gaap_SharesIssued_lbl_2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesIssued_lbl_2" xml:lang="en-US">[Shares, Issued]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl_6c3003" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_StockholdersEquity_lbl_6c3003" xml:lang="en-US">Balance, amount</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl_fdda3c" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_NetIncomeLoss_lbl_fdda3c" xml:lang="en-US">Net loss for the six months</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_lbl_5bc506" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_lbl_5bc506" xml:lang="en-US">Common shares issued for services, shares</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_lbl_9a8ff7" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_lbl_9a8ff7" xml:lang="en-US">Common shares issued for services, amount</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_StockIssuedDuringPeriodSharesIssuedForCash" xlink:label="ctth_StockIssuedDuringPeriodSharesIssuedForCash" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_StockIssuedDuringPeriodSharesIssuedForCash" xlink:to="ctth_StockIssuedDuringPeriodSharesIssuedForCash_lbl_cbe7b4" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_StockIssuedDuringPeriodSharesIssuedForCash_lbl_cbe7b4" xml:lang="en-US">Common shares issued for cash, shares</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_StockIssuedDuringPeriodValueIssuedForCash" xlink:label="ctth_StockIssuedDuringPeriodValueIssuedForCash" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_StockIssuedDuringPeriodValueIssuedForCash" xlink:to="ctth_StockIssuedDuringPeriodValueIssuedForCash_lbl_95e822" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_StockIssuedDuringPeriodValueIssuedForCash_lbl_95e822" xml:lang="en-US">Common shares issued for cash, amount</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssued" xlink:to="us-gaap_SharesIssued_lbl_960d78" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_SharesIssued_lbl_960d78" xml:lang="en-US">Balance, shares</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl_7ae042" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_StockholdersEquity_lbl_7ae042" xml:lang="en-US">Balance, amount</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="us-gaap_StatementOfCashFlowsAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract_lbl_8e9343" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl_8e9343" xml:lang="en-US">Statements of Cash Flow</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl_6415a7" xml:lang="en-US">Cash flows from operating activities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl_36cd2e" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetIncomeLoss_lbl_36cd2e" xml:lang="en-US">Net (loss)</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl_7bc9ad" xml:lang="en-US">Adjustments to reconcile net loss to cash used in operating activities</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_lbl_15f469" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl_15f469" xml:lang="en-US">Amortization expense</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:label="us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl_550127" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_lbl_550127" xml:lang="en-US">Changes in accounts payable and accrued expenses</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet" xlink:label="us-gaap_IncreaseDecreaseInInterestPayableNet" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInInterestPayableNet" xlink:to="us-gaap_IncreaseDecreaseInInterestPayableNet_lbl_083164" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInInterestPayableNet_lbl_083164" xml:lang="en-US">Accrued interest</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl_fee0f9" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl_fee0f9" xml:lang="en-US">Net cash provided (used) by operating activities</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl_9" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl_9" xml:lang="en-US">[Cash Provided by (Used in) Operating Activity, Including Discontinued Operation]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl_720383" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl_720383" xml:lang="en-US">Cash flows from financing activities</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_ProceedsFromSaleOfCommonStock" xlink:label="ctth_ProceedsFromSaleOfCommonStock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_ProceedsFromSaleOfCommonStock" xlink:to="ctth_ProceedsFromSaleOfCommonStock_lbl_d2f8d0" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_ProceedsFromSaleOfCommonStock_lbl_d2f8d0" xml:lang="en-US">Sale of common shares</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl_1240d8" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl_1240d8" xml:lang="en-US">Issuance of common shares</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl_4e343d" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl_4e343d" xml:lang="en-US">Net cash provided (used) by financing activities</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl_13" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl_13" xml:lang="en-US">[Cash Provided by (Used in) Financing Activity, Including Discontinued Operation]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl_a25ecb" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl_a25ecb" xml:lang="en-US">Net change in cash</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl_14" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl_14" xml:lang="en-US">[Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl_2cdabd" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl_2cdabd" xml:lang="en-US">Cash at beginning of period</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl_d6d589" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl_d6d589" xml:lang="en-US">Cash at end of period</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_InsiderTradingArrLineItems" xlink:label="ecd_InsiderTradingArrLineItems" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_InsiderTradingArrLineItems" xlink:to="ecd_InsiderTradingArrLineItems_lbl_9f59bb" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_InsiderTradingArrLineItems_lbl_9f59bb" xml:lang="en-US">Insider Trading Arragements [Line Items]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_Rule10b51ArrAdoptedFlag" xlink:label="ecd_Rule10b51ArrAdoptedFlag" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_Rule10b51ArrAdoptedFlag" xlink:to="ecd_Rule10b51ArrAdoptedFlag_lbl_a70683" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_Rule10b51ArrAdoptedFlag_lbl_a70683" xml:lang="en-US">Rule 10b5-1 Arrangements Adopted [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_Rule10b51ArrTrmntdFlag" xlink:label="ecd_Rule10b51ArrTrmntdFlag" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_Rule10b51ArrTrmntdFlag" xlink:to="ecd_Rule10b51ArrTrmntdFlag_lbl_051669" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_Rule10b51ArrTrmntdFlag_lbl_051669" xml:lang="en-US">Rule 10b5-1 Arrangements Terminated [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonRule10b51ArrAdoptedFlag" xlink:label="ecd_NonRule10b51ArrAdoptedFlag" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_NonRule10b51ArrAdoptedFlag" xlink:to="ecd_NonRule10b51ArrAdoptedFlag_lbl_96e487" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_NonRule10b51ArrAdoptedFlag_lbl_96e487" xml:lang="en-US">Non Rule 10b5-1 Arrangements Adopted [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_NonRule10b51ArrTrmntdFlag" xlink:label="ecd_NonRule10b51ArrTrmntdFlag" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_NonRule10b51ArrTrmntdFlag" xlink:to="ecd_NonRule10b51ArrTrmntdFlag_lbl_bf8642" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_NonRule10b51ArrTrmntdFlag_lbl_bf8642" xml:lang="en-US">Non Rule 10b5-1 Arrangements Terminated [Flag]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_NatureOfOperationAbstract" xlink:label="ctth_NatureOfOperationAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_NatureOfOperationAbstract" xlink:to="ctth_NatureOfOperationAbstract_lbl_d2b51b" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_NatureOfOperationAbstract_lbl_d2b51b" xml:lang="en-US">NATURE OF OPERATIONS</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NatureOfOperations" xlink:to="us-gaap_NatureOfOperations_lbl_7de588" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_NatureOfOperations_lbl_7de588" xml:lang="en-US">NATURE OF OPERATIONS</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NatureOfOperations" xlink:label="us-gaap_NatureOfOperations" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NatureOfOperations" xlink:to="us-gaap_NatureOfOperations_lbl_2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NatureOfOperations_lbl_2" xml:lang="en-US">Nature of Operations [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="us-gaap_AccountingPoliciesAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AccountingPoliciesAbstract_lbl_c7853f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl_c7853f" xml:lang="en-US">SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl_71239b" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl_71239b" xml:lang="en-US">SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl_2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl_2" xml:lang="en-US">Significant Accounting Policies [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_GoingConcernAbstract" xlink:label="ctth_GoingConcernAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_GoingConcernAbstract" xlink:to="ctth_GoingConcernAbstract_lbl_3c76a1" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_GoingConcernAbstract_lbl_3c76a1" xml:lang="en-US">GOING CONCERN</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubstantialDoubtAboutGoingConcernTextBlock" xlink:to="us-gaap_SubstantialDoubtAboutGoingConcernTextBlock_lbl_353b77" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_SubstantialDoubtAboutGoingConcernTextBlock_lbl_353b77" xml:lang="en-US">GOING CONCERN</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubstantialDoubtAboutGoingConcernTextBlock" xlink:label="us-gaap_SubstantialDoubtAboutGoingConcernTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubstantialDoubtAboutGoingConcernTextBlock" xlink:to="us-gaap_SubstantialDoubtAboutGoingConcernTextBlock_lbl_2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubstantialDoubtAboutGoingConcernTextBlock_lbl_2" xml:lang="en-US">Substantial Doubt about Going Concern [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_ComparativeFinancialStatementsAbstract" xlink:label="ctth_ComparativeFinancialStatementsAbstract" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_ComparativeFinancialStatementsAbstract_lbl_a83c3b" xml:lang="en-US">COMPARATIVE FINANCIAL STATEMENTS</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_ComparativeFinancialStatementsDisclosureTextBlock" xlink:to="ctth_ComparativeFinancialStatementsDisclosureTextBlock_lbl_069ab3" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ctth_ComparativeFinancialStatementsDisclosureTextBlock_lbl_069ab3" xml:lang="en-US">COMPARATIVE FINANCIAL STATEMENTS</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_ComparativeFinancialStatementsDisclosureTextBlock" xlink:label="ctth_ComparativeFinancialStatementsDisclosureTextBlock" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_ComparativeFinancialStatementsDisclosureTextBlock_lbl_2" xml:lang="en-US">[COMPARATIVE FINANCIAL STATEMENTS]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="us-gaap_StockholdersEquityNoteAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityNoteAbstract" xlink:to="us-gaap_StockholdersEquityNoteAbstract_lbl_f30d8e" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityNoteAbstract_lbl_f30d8e" xml:lang="en-US">STOCKHOLDERS EQUITY</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:to="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl_af45b3" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl_af45b3" xml:lang="en-US">STOCKHOLDERS' EQUITY</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_IntangibleAssetsAbstract" xlink:label="ctth_IntangibleAssetsAbstract" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_IntangibleAssetsAbstract" xlink:to="ctth_IntangibleAssetsAbstract_lbl_aaee3a" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_IntangibleAssetsAbstract_lbl_aaee3a" xml:lang="en-US">INTANGIBLE ASSETS</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:to="us-gaap_IntangibleAssetsDisclosureTextBlock_lbl_e99125" xlink:type="arc" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:label="us-gaap_IntangibleAssetsDisclosureTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:to="us-gaap_IntangibleAssetsDisclosureTextBlock_lbl_2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IntangibleAssetsDisclosureTextBlock_lbl_2" xml:lang="en-US">Intangible Assets Disclosure [Text Block]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:to="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl_757670" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl_757670" xml:lang="en-US">Basis of accounting</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UseOfEstimates" xlink:label="us-gaap_UseOfEstimates" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UseOfEstimates" xlink:to="us-gaap_UseOfEstimates_lbl_5a4587" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UseOfEstimates_lbl_5a4587" xml:lang="en-US">Use of estimates</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:to="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl_4da8dc" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueOfFinancialInstrumentsPolicy_lbl_4da8dc" xml:lang="en-US">Financial instruments</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueRecognitionPolicyTextBlock" xlink:to="us-gaap_RevenueRecognitionPolicyTextBlock_lbl_88dc0f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl_88dc0f" xml:lang="en-US">Revenue recognition</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerSharePolicyTextBlock" xlink:to="us-gaap_EarningsPerSharePolicyTextBlock_lbl_6e406f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl_6e406f" xml:lang="en-US">Earnings per share</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskCreditRisk" xlink:label="us-gaap_ConcentrationRiskCreditRisk" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConcentrationRiskCreditRisk" xlink:to="us-gaap_ConcentrationRiskCreditRisk_lbl_e6d37d" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConcentrationRiskCreditRisk_lbl_e6d37d" xml:lang="en-US">Concentrations of credit risk</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventsPolicyPolicyTextBlock" xlink:label="us-gaap_SubsequentEventsPolicyPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventsPolicyPolicyTextBlock" xlink:to="us-gaap_SubsequentEventsPolicyPolicyTextBlock_lbl_9b3513" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventsPolicyPolicyTextBlock_lbl_9b3513" xml:lang="en-US">Subsequent events</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:to="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl_8ccf85" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl_8ccf85" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_RelatedPartyPayablesPolicyTextBlock" xlink:to="ctth_RelatedPartyPayablesPolicyTextBlock_lbl_760282" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ctth_RelatedPartyPayablesPolicyTextBlock_lbl_760282" xml:lang="en-US">Related-party payables</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_RelatedPartyPayablesPolicyTextBlock" xlink:label="ctth_RelatedPartyPayablesPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_RelatedPartyPayablesPolicyTextBlock" xlink:to="ctth_RelatedPartyPayablesPolicyTextBlock_lbl_10" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_RelatedPartyPayablesPolicyTextBlock_lbl_10" xml:lang="en-US">[Related-party payables]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_RelatedPartyNotesPayablesPolicyTextBlock" xlink:to="ctth_RelatedPartyNotesPayablesPolicyTextBlock_lbl_714718" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ctth_RelatedPartyNotesPayablesPolicyTextBlock_lbl_714718" xml:lang="en-US">Related-party note payable</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_RelatedPartyNotesPayablesPolicyTextBlock" xlink:label="ctth_RelatedPartyNotesPayablesPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_RelatedPartyNotesPayablesPolicyTextBlock" xlink:to="ctth_RelatedPartyNotesPayablesPolicyTextBlock_lbl_11" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_RelatedPartyNotesPayablesPolicyTextBlock_lbl_11" xml:lang="en-US">[Related-party note payable]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:to="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl_085d06" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl_085d06" xml:lang="en-US">Share-based compensation</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdvertisingCostsPolicyTextBlock" xlink:label="us-gaap_AdvertisingCostsPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdvertisingCostsPolicyTextBlock" xlink:to="us-gaap_AdvertisingCostsPolicyTextBlock_lbl_1bb3bf" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdvertisingCostsPolicyTextBlock_lbl_1bb3bf" xml:lang="en-US">Advertising</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="us-gaap_IncomeTaxPolicyTextBlock" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxPolicyTextBlock" xlink:to="us-gaap_IncomeTaxPolicyTextBlock_lbl_c80a25" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl_c80a25" xml:lang="en-US">Income taxes</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsFiniteLivedPolicy" xlink:label="us-gaap_IntangibleAssetsFiniteLivedPolicy" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IntangibleAssetsFiniteLivedPolicy" xlink:to="us-gaap_IntangibleAssetsFiniteLivedPolicy_lbl_b068ea" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IntangibleAssetsFiniteLivedPolicy_lbl_b068ea" xml:lang="en-US">Intangible assets</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_lbl_3130db" xml:lang="en-US">Schedule of intangible assets</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_ScheduleOfInformationAboutPatentsTableTextBlock" xlink:label="ctth_ScheduleOfInformationAboutPatentsTableTextBlock" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_ScheduleOfInformationAboutPatentsTableTextBlock_lbl_8db6ed" xml:lang="en-US">Schedule of information about patents</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl_f88e8c" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl_f88e8c" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksMember" xlink:label="us-gaap_TrademarksMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TrademarksMember" xlink:to="us-gaap_TrademarksMember_lbl_7ef18f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TrademarksMember_lbl_7ef18f" xml:lang="en-US">Trademarks [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PatentsMember" xlink:label="us-gaap_PatentsMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PatentsMember" xlink:to="us-gaap_PatentsMember_lbl_150e48" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PatentsMember_lbl_150e48" xml:lang="en-US">Patents [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_IntangibleAssetsUsefulLife" xlink:label="ctth_IntangibleAssetsUsefulLife" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_IntangibleAssetsUsefulLife" xlink:to="ctth_IntangibleAssetsUsefulLife_lbl_74c83f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_IntangibleAssetsUsefulLife_lbl_74c83f" xml:lang="en-US">Intangible assets useful life</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualAxis_lbl_61f89b" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_TitleOfIndividualAxis_lbl_61f89b" xml:lang="en-US">Title and Position [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis" xlink:label="us-gaap_RelatedPartyTransactionAxis" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionAxis_lbl_3886a8" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl_3886a8" xml:lang="en-US">Related Party Transaction [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_KatherineColeMember" xlink:label="ctth_KatherineColeMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_KatherineColeMember" xlink:to="ctth_KatherineColeMember_lbl_db59cc" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_KatherineColeMember_lbl_db59cc" xml:lang="en-US">Katherine Cole [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_RyanKhouriMember" xlink:label="ctth_RyanKhouriMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_RyanKhouriMember" xlink:to="ctth_RyanKhouriMember_lbl_f0d226" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_RyanKhouriMember_lbl_f0d226" xml:lang="en-US">Ryan Khouri [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_AllenGreenspoonMember" xlink:label="ctth_AllenGreenspoonMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_AllenGreenspoonMember" xlink:to="ctth_AllenGreenspoonMember_lbl_6217b2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_AllenGreenspoonMember_lbl_6217b2" xml:lang="en-US">Allen Greenspoon [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_JohnJenneweinMember" xlink:label="ctth_JohnJenneweinMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_JohnJenneweinMember" xlink:to="ctth_JohnJenneweinMember_lbl_304c23" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_JohnJenneweinMember_lbl_304c23" xml:lang="en-US">John Jennewein [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_PetroCzupielMember" xlink:label="ctth_PetroCzupielMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_PetroCzupielMember" xlink:to="ctth_PetroCzupielMember_lbl_6a7e00" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_PetroCzupielMember_lbl_6a7e00" xml:lang="en-US">Petro Czupiel [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_MurrayGoldenbergMember" xlink:label="ctth_MurrayGoldenbergMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_MurrayGoldenbergMember" xlink:to="ctth_MurrayGoldenbergMember_lbl_a163c3" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_MurrayGoldenbergMember_lbl_a163c3" xml:lang="en-US">Murray Goldenberg [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_BordersConsultingLLCMember" xlink:label="ctth_BordersConsultingLLCMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_BordersConsultingLLCMember" xlink:to="ctth_BordersConsultingLLCMember_lbl_be6e92" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_BordersConsultingLLCMember_lbl_be6e92" xml:lang="en-US">Borders Consulting LLC [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_FrankHaritonMember" xlink:label="ctth_FrankHaritonMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_FrankHaritonMember" xlink:to="ctth_FrankHaritonMember_lbl_32a819" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_FrankHaritonMember_lbl_32a819" xml:lang="en-US">Frank Hariton [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_KevinSakserMember" xlink:label="ctth_KevinSakserMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_KevinSakserMember" xlink:to="ctth_KevinSakserMember_lbl_e267bd" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_KevinSakserMember_lbl_e267bd" xml:lang="en-US">Kevin Sakser [Member]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesAuthorized" xlink:to="us-gaap_PreferredStockSharesAuthorized_lbl_31ce2f" xlink:type="arc" />
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesIssued" xlink:to="us-gaap_PreferredStockSharesIssued_lbl_41cfb9" xlink:type="arc" />
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockSharesOutstanding" xlink:to="us-gaap_PreferredStockSharesOutstanding_lbl_c20263" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl_c20263" xml:lang="en-US">Preferred stock, shares outstanding</link:label>
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl_ccc322" xml:lang="en-US">Common stock, shares authorized</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl_0a2776" xlink:type="arc" />
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl_063341" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl_063341" xml:lang="en-US">Common stock, shares outstanding</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl_b0068e" xlink:type="arc" />
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_StockIssuedDuringPeriodSharesIssuedForCash" xlink:to="ctth_StockIssuedDuringPeriodSharesIssuedForCash_lbl_5e4f2e" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ctth_StockIssuedDuringPeriodSharesIssuedForCash_lbl_5e4f2e" xml:lang="en-US">Common stock issued for cash, shares</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_StockIssuedDuringPeriodValueIssuedForCash" xlink:to="ctth_StockIssuedDuringPeriodValueIssuedForCash_lbl_177175" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="ctth_StockIssuedDuringPeriodValueIssuedForCash_lbl_177175" xml:lang="en-US">Common stock issued for cash, amount</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_lbl_85b13f" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesIssuedForServices_lbl_85b13f" xml:lang="en-US">Common shares issued for services, shares</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:to="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_lbl_ef7444" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueIssuedForServices_lbl_ef7444" xml:lang="en-US">Common shares issued for services, amount</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_FiniteLivedDeferredPatentCostsGross" xlink:label="ctth_FiniteLivedDeferredPatentCostsGross" />
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedPatentsGross" xlink:label="us-gaap_FiniteLivedPatentsGross" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedPatentsGross" xlink:to="us-gaap_FiniteLivedPatentsGross_lbl_5205d5" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedPatentsGross_lbl_5205d5" xml:lang="en-US">Patents</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedTrademarksGross" xlink:label="us-gaap_FiniteLivedTrademarksGross" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedTrademarksGross" xlink:to="us-gaap_FiniteLivedTrademarksGross_lbl_6112cb" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedTrademarksGross_lbl_6112cb" xml:lang="en-US">Trademarks</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl_6652e3" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl_6652e3" xml:lang="en-US">Less: Accumulated amortization</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl_5" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_lbl_5" xml:lang="en-US">[Finite-Lived Intangible Assets, Accumulated Amortization]</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IntangibleAssetsCurrent" xlink:to="us-gaap_IntangibleAssetsCurrent_lbl_58cb42" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IntangibleAssetsCurrent_lbl_58cb42" xml:lang="en-US">Intangible assets, net</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsCurrent" xlink:label="us-gaap_IntangibleAssetsCurrent" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IntangibleAssetsCurrent" xlink:to="us-gaap_IntangibleAssetsCurrent_lbl_6" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IntangibleAssetsCurrent_lbl_6" xml:lang="en-US">[Intangible Assets, Current]</link:label>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicDistributionAxis" xlink:label="us-gaap_GeographicDistributionAxis" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GeographicDistributionAxis" xlink:to="us-gaap_GeographicDistributionAxis_lbl_e78d20" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GeographicDistributionAxis_lbl_e78d20" xml:lang="en-US">Geographic Distribution [Axis]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_UsCountryMember" xlink:label="ctth_UsCountryMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_UsCountryMember" xlink:to="ctth_UsCountryMember_lbl_2e7816" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_UsCountryMember_lbl_2e7816" xml:lang="en-US">US [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_CanadaCountryMember" xlink:label="ctth_CanadaCountryMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_CanadaCountryMember" xlink:to="ctth_CanadaCountryMember_lbl_0a36b2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_CanadaCountryMember_lbl_0a36b2" xml:lang="en-US">Canada [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_UsOneCountryMember" xlink:label="ctth_UsOneCountryMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_UsOneCountryMember" xlink:to="ctth_UsOneCountryMember_lbl_778f94" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_UsOneCountryMember_lbl_778f94" xml:lang="en-US">US One [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_CanadaOneCountryMember" xlink:label="ctth_CanadaOneCountryMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_CanadaOneCountryMember" xlink:to="ctth_CanadaOneCountryMember_lbl_c8528e" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_CanadaOneCountryMember_lbl_c8528e" xml:lang="en-US">Canada One [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_UsTwoCountryMember" xlink:label="ctth_UsTwoCountryMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_UsTwoCountryMember" xlink:to="ctth_UsTwoCountryMember_lbl_0edec2" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_UsTwoCountryMember_lbl_0edec2" xml:lang="en-US">US Two [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_EuropeCountryMember" xlink:label="ctth_EuropeCountryMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_EuropeCountryMember" xlink:to="ctth_EuropeCountryMember_lbl_a5c849" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_EuropeCountryMember_lbl_a5c849" xml:lang="en-US">Europe [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_MexicoCountryMember" xlink:label="ctth_MexicoCountryMember" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_MexicoCountryMember" xlink:to="ctth_MexicoCountryMember_lbl_3dd4f3" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_MexicoCountryMember_lbl_3dd4f3" xml:lang="en-US">Mexico [Member]</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_PatentNumberDescription" xlink:label="ctth_PatentNumberDescription" />
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    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_PatentNumberDescription_lbl_192ca4" xml:lang="en-US">Patent No.</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_FileDateDescription" xlink:label="ctth_FileDateDescription" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_FileDateDescription" xlink:to="ctth_FileDateDescription_lbl_6253f3" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_FileDateDescription_lbl_6253f3" xml:lang="en-US">File Date</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_ExpirationDateDescription" xlink:label="ctth_ExpirationDateDescription" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_ExpirationDateDescription" xlink:to="ctth_ExpirationDateDescription_lbl_b133d0" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_ExpirationDateDescription_lbl_b133d0" xml:lang="en-US">Expiration Date</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AmortizationOfIntangibleAssets" xlink:to="us-gaap_AmortizationOfIntangibleAssets_lbl_2a9e31" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AmortizationOfIntangibleAssets_lbl_2a9e31" xml:lang="en-US">Amortization expenses</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_TrademarkFileDateDescription" xlink:label="ctth_TrademarkFileDateDescription" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_TrademarkFileDateDescription" xlink:to="ctth_TrademarkFileDateDescription_lbl_c3fe03" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_TrademarkFileDateDescription_lbl_c3fe03" xml:lang="en-US">Trademark File Date</link:label>
    <link:loc xlink:type="locator" xlink:href="ctth-20260630.xsd#ctth_TrademarkExpirationDateDescription" xlink:label="ctth_TrademarkExpirationDateDescription" />
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ctth_TrademarkExpirationDateDescription" xlink:to="ctth_TrademarkExpirationDateDescription_lbl_13b0c7" xlink:type="arc" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ctth_TrademarkExpirationDateDescription_lbl_13b0c7" xml:lang="en-US">Trademark Expiration Date</link:label>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" xlink:from="ctth_ConsultingFees" xlink:to="ctth_ConsultingFees_d" />
    <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xml:lang="en-US" xlink:label="ctth_ConsultingFees_d">Fees incurred for consulting services.</link:label>
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