Side Letter between Larkspur Health LLC and certain Additional Sponsor Investors

Exhibit 10.20

November 18, 2021

Larkspur Health Acquisition Corp.

100 Somerset Corporate Blvd., 2^nd Floor

Bridgewater, New Jersey 08807

Attn: Daniel J. O’Connor, CEO

Email: ***@***

Re: Founder Shares Transfer by Larkspur Health LLC

Ladies and Gentlemen:

Reference is made to (i) the Underwriting Agreement (the “Underwriting Agreement”) to be entered into by and among Larkspur Health Acquisition Corp., a Delaware corporation (the “Company”), and A.G.P./Alliance Global Partners, as representative (the “Representative”) of the several underwriters (each, an “Underwriter” and collectively, the “Underwriters”), relating to an underwritten initial public offering (the “Public Offering”), of 7,500,000 of the Company’s units (including up to 1,125,000 units that may be purchased to cover over-allotments, if any) (the “Units”), each comprised of one share of the Company’s common stock, par value $0.0001 per share (the “Common Stock”), and three-fourths of one redeemable warrant (the “Warrant”), and (ii) that certain Subscription Agreement (the “Larkspur Subscription Agreement”) by and between the Company and Larkspur Health LLC (“Larkspur”), pursuant to which Larkspur received 1,494,998 shares of common stock, par value $0.0001 per share, of the Company (the “Shares”).

In order to induce the undersigned investors (the “Additional Sponsor Investors,” and together with Larkspur, the “Sponsors”) to participate in their roles as the sponsors to the Company in connection with entering into the Underwriting Agreement and the Public Offering, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Larkspur hereby agrees to assign and transfer 231,423 of the Shares to the Additional Sponsor Investors in the amounts set forth on Exhibit A, and the Additional Sponsor Investors hereby agree to pay to Larkspur the amount of purchase price set forth on Exhibit A, effective as of the date hereof.

This letter agreement may not be changed, amended, modified or waived as to any particular provision, with or without the consent of the parties hereto. No party hereto may assign either this letter agreement or any of its rights, interests, or obligations hereunder. Any purported assignment in violation of this paragraph shall be void and ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee. This letter agreement may be executed in any number of original or facsimile counterparts and each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. This letter agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall not affect the validity or enforceability of this letter agreement or of any other term or provision hereof. This letter agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. The parties hereto (i) all agree that any action, proceeding, claim or dispute arising out of, or relating in any way to, this letter agreement shall be brought and enforced in the courts of New York City, in the State of New York, and irrevocably submit to such jurisdiction and venue, which jurisdiction and venue shall be exclusive and (ii) waive any objection to such exclusive jurisdiction and venue or that such courts represent an inconvenient forum.

Unless otherwise specifically provided herein, the terms, rights and obligations with regard to the Shares upon transfer to the Sponsors shall be governed by the terms, rights and obligations as set forth in the Larkspur Subscription Agreement.

[Signature Page Follows]

Acknowledged and Agreed:

[Signature Page to Side Letter – Larkspur Health LLC & New Investors]

Exhibit A