EXECUTION VERSION PRIVETERRA SPONSOR, LLC 300 SE 2nd Street, Suite 600 Fort Lauderdale, Florida 33301

300 SE 2nd Street, Suite 600

Fort Lauderdale, Florida 33301

ACM ASOF VIII Secondary-C LP

One Rockefeller Plaza, 32nd Floor

New York, New York 10020

This letter agreement (the

"Agreement") is being made as of June 29, 2023, by and between ACM ASOF VIII Secondary-C LP ("Subscriber")

and Priveterra Sponsor, LLC ("Sponsor"). Capitalized terms used, but not otherwise defined herein, shall have the meaning

given to them in the Subscription Agreement (as defined below).

In connection with that certain

Subscription Agreement (the "Subscription Agreement"), dated as of the date hereof, by and between Priveterra Acquisition

Corp. (the "Company") and Subscriber and that certain Forward Purchase Agreement by and among the Company, AEON Biopharma,

Inc., and ACM ARRT J LLC (the "Forward Purchase Agreement"), dated as of the date hereof, and in consideration for

the mutual promises made herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged,

the Sponsor and Subscriber agree as follows:

In the event that the Transfer

VWAP for the shares of common stock of the Company, par value $0.0001 per share (the "Common Shares"), purchased pursuant

to the Subscription Agreement that are Transferred during the Measurement Period (the "Transferred PIPE Shares") is

less than $7.00 per share, then (i) Subscriber shall be entitled to receive a number of additional Common Shares that have been registered

for resale by the Company under an effective resale registration statement pursuant to the Securities Act of 1933, as amended, under which

Subscriber may sell or transfer such Common Shares in an amount that is equal to the Additional Shares and (ii) Sponsor shall promptly

(but in any event within fifteen (15) Business Days) after the Measurement Date, transfer the Additional Shares to the Subscriber. In

this regard, Sponsor and Subscriber shall enter into a customary assignment agreement pursuant to Section 5.2.2 of that certain Registration

Rights Agreement to be dated as of the Measurement Date (the "RRA") to make Subscriber a "Permitted Transferee"

(within the meaning of the RRA) such that Subscriber has the benefit of the RRA including any then effective registration statement covering

the resale of such Additional Shares to the extent that such Additional Shares are not otherwise freely transferrable under the Securities

Act of 1933, as amended. For the avoidance of doubt, in the event the Transfer VWAP for the Transferred PIPE Shares is equal to or more

than $7.00 per share, then the Subscriber shall not be entitled to any Additional Shares. Notwithstanding anything to the contrary herein,

no fraction of a Common Share will be delivered pursuant to this Agreement, and if the Subscriber would otherwise be entitled to a fraction

of a Common Share, the Subscriber shall instead have the number of Additional Shares issued to the Subscriber rounded down to the nearest

whole Common Share. All references in this Agreement to numbers of shares, per share amounts and share prices shall be appropriately adjusted

to reflect any stock split, stock dividend, stock combination, recapitalization or similar adjustment occurring after the date hereof.

For the purposes of this Agreement:

Sponsor hereby represents

and warrants to Subscriber as follows:

Within five (5) days

following the end of each calendar month during the Measurement Period, Subscriber shall provide to Sponsor a reasonably detailed written

report evidencing any Transfer of Shares made during such calendar month and the price at which such Transfer was made, in such form as

reasonably acceptable to Sponsor.

Section 8(a), (h), (i),

(j), (l), (m), (o), (p), (q), and (v) of the Subscription Agreement are incorporated herein by reference, mutatis mutandis.

[Signature Page Follows]

[Signature Page to ACM ASOF VIII Secondary-C

LP PIPE Side Letter]