UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number: 001-42263

iTonic Holdings Ltd

(Exact name of registrant as specified in its charter)

Room 405, LongHu Hailanyinqing Industrial Park,

Building 6, No. 8 Beiyuan Xiaojie, Chaoyang District, Beijing, China

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒        Form 40-F ☐

EXPLANATORY NOTE

iTonic Holdings Ltd (the “Company”) is furnishing (i) its unaudited condensed consolidated financial statements as of June 30, 2026 and for the six months ended June 30, 2026 and 2025, attached as Exhibit 99.1 to this report; (ii) its management’s discussion and analysis of financial condition and results of operations in connection with such financial statements, attached as Exhibit 99.2 to this report.

INCORPORATION BY REFERENCE

This report on Form 6-K, including Exhibits 99.1 and 99.2 hereto, is hereby incorporated by reference into the Company’s registration statement on Form F-3 (File No. 333-293241), as amended, and the Company’s registration statement on Form S-8 (File No. 333-286673), and into each prospectus outstanding under the foregoing registration statements, and shall be a part thereof from the date on which this report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished by the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.

Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: September 30, 2026

ATTACHMENTS / EXHIBITS

UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS OF ITONIC HOLDINGS LTD. AND ITS SUBSIDIARIES AS OF JUNE 30, 2026 AND FOR THE SIX MONTHS ENDED JUNE 30, 2026 AND 2025

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

XBRL SCHEMA FILE

XBRL CALCULATION FILE

XBRL DEFINITION FILE

XBRL LABEL FILE

XBRL PRESENTATION FILE

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