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  <xsd:element abstract="true" id="mtex_IncentiveOptionMember" name="IncentiveOptionMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_IncreaseDecreaseInCommissionsAndIncentivesPayable" name="IncreaseDecreaseInCommissionsAndIncentivesPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="mtex_IncreaseDecreaseInDeferredCommissions" name="IncreaseDecreaseInDeferredCommissions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="mtex_IncreaseDecreaseInSalesCommission" name="IncreaseDecreaseInSalesCommission" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="mtex_InventoryBalancesByGeographicAreasTableTextBlock" name="InventoryBalancesByGeographicAreasTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_JStanleyFrederickMember" name="JStanleyFrederickMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_JadeCapitalMember" name="JadeCapitalMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_KevinRobbinsMember" name="KevinRobbinsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_LesseeOperatingAndFinanceLeasesTextBlock" name="LesseeOperatingAndFinanceLeasesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_LesseeOperatingLeaseLiabilityToBePaidThereafter" name="LesseeOperatingLeaseLiabilityToBePaidThereafter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_LesseeOperatingSubleaseTermOfContract" name="LesseeOperatingSubleaseTermOfContract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="instant"/>
  <xsd:element id="mtex_LongtermDebtMaturityThereafter" name="LongtermDebtMaturityThereafter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_LossContingencyOpenOrPendingClaimsNumber" name="LossContingencyOpenOrPendingClaimsNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="mtex_LoyaltyProgramMember" name="LoyaltyProgramMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_NumberOfGeographicMarkets" name="NumberOfGeographicMarkets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_NumberOfRegionsInWhichEntityOperates" name="NumberOfRegionsInWhichEntityOperates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/>
  <xsd:element id="mtex_OperatingAndFinanceLeaseLiabilityTotal" name="OperatingAndFinanceLeaseLiabilityTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_OperatingAndFinanceLeaseRightofuseAssetAfterAccumulatedAmortizationTotal" name="OperatingAndFinanceLeaseRightofuseAssetAfterAccumulatedAmortizationTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_OtherAssetsPolicyTextBlock" name="OtherAssetsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_OtherLongtermLiabilitiesPolicyPolicyTextBlock" name="OtherLongtermLiabilitiesPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_PolicyTable" name="PolicyTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_PropertyPlantAndEquipmentWithConstructionInProgressNet" name="PropertyPlantAndEquipmentWithConstructionInProgressNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_SalesRefundAndAllowancesPolicyTextBlock" name="SalesRefundAndAllowancesPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_ScheduleOfFutureMinimumLeasePaymentsForOperatingAndFinanceLeasesTableTextBlock" name="ScheduleOfFutureMinimumLeasePaymentsForOperatingAndFinanceLeasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_ScheduleOfSalesReturnReserveTableTextBlock" name="ScheduleOfSalesReturnReserveTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue" name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="mtex_SharebasedPaymentArrangementOptionTreasuryStockMember" name="SharebasedPaymentArrangementOptionTreasuryStockMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_SubleaseIncomeFuturePaymentsReceivableDueNextTwelveMonths" name="SubleaseIncomeFuturePaymentsReceivableDueNextTwelveMonths" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_SubleaseIncomeFuturePaymentsReceivableDueYearTwo" name="SubleaseIncomeFuturePaymentsReceivableDueYearTwo" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_SubleaseIncomeFuturePaymentsReceivablePresentValue" name="SubleaseIncomeFuturePaymentsReceivablePresentValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_SubleaseIncomeFuturePaymentsReceivableRemainderOfFiscalYear" name="SubleaseIncomeFuturePaymentsReceivableRemainderOfFiscalYear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_SubleaseIncomeFuturePaymentsReceivableThereafter" name="SubleaseIncomeFuturePaymentsReceivableThereafter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_SubleaseIncomeFuturePaymentsReceivableTotal" name="SubleaseIncomeFuturePaymentsReceivableTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="mtex_SubleaseIncomeImputedInterest" name="SubleaseIncomeImputedInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="mtex_The2017StockIncentivePlanMember" name="The2017StockIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="mtex_WorkingCapitalDeficit" name="WorkingCapitalDeficit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-accounts-receivable-net-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-accounts-receivable-net-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-accrued-expenses-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-accrued-expenses-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-allowance-for-credit-losses-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-allowance-for-credit-losses-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-cash-cash-equivalents-and-restricted-cash-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-cash-cash-equivalents-and-restricted-cash-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-deferred-revenue-commissions-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-deferred-revenue-commissions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-deferred-revenue-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-deferred-revenue-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-deferred-revenue-loyalty-program-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-deferred-revenue-loyalty-program-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-other-assets-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-other-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-other-longterm-liabilities-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-other-longterm-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-sales-return-reserve-details" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-sales-return-reserve-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-tables" name="statement-statement-note-1-organization-and-summary-of-significant-accounting-policies-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-10-fair-value-financial-assets-details" name="statement-statement-note-10-fair-value-financial-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-10-fair-value-financial-intruments-carrying-amount-and-estimated-fair-value-details" name="statement-statement-note-10-fair-value-financial-intruments-carrying-amount-and-estimated-fair-value-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-10-fair-value-tables" name="statement-statement-note-10-fair-value-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-11-segment-information-consolidated-net-sales-by-products-fees-and-others-details" name="statement-statement-note-11-segment-information-consolidated-net-sales-by-products-fees-and-others-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-11-segment-information-consolidated-net-sales-by-region-details" name="statement-statement-note-11-segment-information-consolidated-net-sales-by-region-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-11-segment-information-inventory-balances-by-region-details" name="statement-statement-note-11-segment-information-inventory-balances-by-region-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-11-segment-information-longlived-assets-by-geographic-area-details" name="statement-statement-note-11-segment-information-longlived-assets-by-geographic-area-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-11-segment-information-revenue-from-segments-details" name="statement-statement-note-11-segment-information-revenue-from-segments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-11-segment-information-tables" name="statement-statement-note-11-segment-information-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-12-earnings-per-share-net-eps-details" name="statement-statement-note-12-earnings-per-share-net-eps-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-12-earnings-per-share-tables" name="statement-statement-note-12-earnings-per-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-3-inventories-inventories-details" name="statement-statement-note-3-inventories-inventories-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-3-inventories-tables" name="statement-statement-note-3-inventories-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-5-notes-payable-future-principal-payments-details" name="statement-statement-note-5-notes-payable-future-principal-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-5-notes-payable-tables" name="statement-statement-note-5-notes-payable-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-6-stock-based-compensation-compensation-expense-details" name="statement-statement-note-6-stock-based-compensation-compensation-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-6-stock-based-compensation-tables" name="statement-statement-note-6-stock-based-compensation-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-7-shareholders-equity-accumulated-other-comprehensive-loss-details" name="statement-statement-note-7-shareholders-equity-accumulated-other-comprehensive-loss-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-7-shareholders-equity-tables" name="statement-statement-note-7-shareholders-equity-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-9-leases-future-sublease-income-and-maturities-of-leases-details" name="statement-statement-note-9-leases-future-sublease-income-and-maturities-of-leases-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-9-leases-operating-and-finance-leases-details" name="statement-statement-note-9-leases-operating-and-finance-leases-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-9-leases-operating-and-finance-leases-details-parentheticals" name="statement-statement-note-9-leases-operating-and-finance-leases-details-parentheticals" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-note-9-leases-tables" name="statement-statement-note-9-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="mtex_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
