KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Julius Kalcevich with full power to act singly, as the undersigned's
true and lawful attorney-in-fact, with full power of substitution, to:

1)  execute for and on behalf of the undersigned, in the undersigned's capacity
    as an officer and/or director and/or beneficial owner of iAnthus Capital
    Holdings, Inc. (the "Company"), Forms 3, 4, and 5 in accordance with Section
    16(a) of the Securities Exchange Act of 1934, as amended, and the rules

2)  do and perform any and all acts for and on behalf of the undersigned which
    may be necessary or desirable to complete and execute any such Form 3, 4, or
    5, complete and execute any amendment or amendments thereto, and timely file
    such form with the United States Securities and Exchange Commission and any
    stock exchange or similar authority; and

3)  take any other action of any type whatsoever in connection with the
    foregoing which, in the opinion of such attorney-in-fact, may be of benefit
    to, in the best interest of, or legally required by, the undersigned, it
    being understood that the documents executed by such attorney-in-fact on
    behalf of the undersigned pursuant to this Power of Attorney shall be in
    such form and shall contain such terms and conditions as such attorney-in-
    fact may approve in such attorney-in-fact's discretion.

    The undersigned hereby grants to the attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact or such attorney-
in-fact's substitute or substitutes, shall lawfully do or cause to be done by
virtue of this power of attorney and the rights and powers herein granted.

    This power of attorney shall remain in full force and effect until revoked
by the undersigned in a signed writing delivered to the attorney-in-fact.

    IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 18th day of August 2022.

                                 By:    /s/ Kenneth Gilbert
                                 Name:  Kenneth Gilbert
                                 Title: Director