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Common StockThis prospectus supplement (the “Prospectus Supplement”) amends and supplements the prospectus supplement dated September 20, 2024, and its accompanying base prospectus dated September 20, 2024, the prospectus supplement dated December 19, 2024, theprospectus supplement dated February 14, 2025, and the prospectus supplement dated May 12, 2025 (collectively, the “ATM Prospectus”), relating to the offer and sale of shares of our common stock from time to time pursuant to the terms of At The MarketOffering Agreement dated September 13, 2024 (the “ATM Agreement”) with H.C. Wainwright & Co., LLC (the “Sales Agent”), acting as sales agent or principal. This Prospectus Supplement should be read in conjunction with the ATM Prospectus, and isqualified by reference thereto, except to the extent that the information herein amends or supersedes the information contained in the ATM Prospectus. This Prospectus Supplement is not complete without and may only be delivered or utilized in connection with theATM Prospectus, and any future amendments or supplements thereto.We are filing this Prospectus Supplement to amend the ATM Prospectus to increase the amount of shares we may offer and sellthrough the Sales Agent pursuant to the ATM Agreement to $46,000,000, which does not include the $27,136,550.49of shares thatwere previously sold pursuant to the ATM Agreement as of the date of this Prospectus Supplement. exchange or otherwise, directly to the Sales Agent as principal, in negotiated transactions at market prices prevailing at the time of saleor at prices related to such prevailing market prices, and/or in any other method permitted by law. The Sales Agent is not required tosell any specific number or dollar amount of shares, but will act as sales agent on a commercially reasonable efforts basis consistent Our common stock trades on the Nasdaq under the symbol “YHC.” The last reported sale price of our common stock on Nasdaq onJuly 14, 2025 was $4.6 per share.INVESTING IN OUR SECURITIES INVOLVES RISKS. SEE THE “RISK FACTORS” BEGINNING ON PAGE 5 OF THEATMPROSPECTUS AND IN THE DOCUMENTS INCORPORATED BY REFERENCE IN THE REGISTRATIONSTATEMENT CONCERNING FACTORS YOU SHOULD CONSIDER BEFORE INVESTING IN OUR COMMON STOCK. H.C. Wainwright & Co. The date of this prospectus supplement is July 14, 2025.