POWER OF ATTORNEY

        Know all by these presents that the undersigned hereby constitutes and
appoints Christopher Piazza of Neptune Wellness Solutions Inc. (the "Company"),
the undersigned's true and lawful attorney-in-fact and agent to:

        (1) Prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to the Securities and Exchange Commission (the "SEC") Form
ID, Uniform Application for Access Codes to File on EDGAR, including amendments
thereto, and any other documents necessary or appropriate to obtain codes and
passwords enabling the undersigned to make electronic filings with the SEC of
reports required by Section 16(a) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), or any rule or regulation thereunder;

        (2) Prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to the SEC Forms 3, 4 and 5 (including amendments thereto
and joint filing agreements in connection therewith) in accordance with Section
16(a) of the Exchange Act and the rules and regulations thereunder in the
undersigned's capacity as an officer, director or beneficial owner of more than
10% of a registered class of securities of the Company;

        (3) Do and perform any and all acts for and on behalf of the
undersigned that may be necessary or desirable to prepare and execute any such
Form ID and Forms 3, 4 or 5 (including amendments thereto and joint filing
agreements in connection therewith) and file such forms with the SEC and any
stock exchange, self-regulatory association or any similar authority; and

        (4) Take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required of the undersigned, it being
understood that the documents executed by the 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 the attorney-in-fact may approve in the
attorney-in-fact's discretion.

        The undersigned hereby grants to such 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. The undersigned acknowledges that the foregoing attorney-in-fact, and
their substitutes, in serving in such capacity at the request of the
undersigned, are not assuming (nor is the Company assuming) any of the
undersigned's responsibilities to comply with Section 16 of the Exchange Act.

        This Power of Attorney shall remain in full force and effect until the
earliest to occur of (a) the undersigned is no longer required to file Form ID
or Forms 3, 4 and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, (b) revocation by the
undersigned in a signed writing delivered to the Company and the foregoing
attorney-in fact or (c) as to any attorney-in-fact individually, until such
attorney-in-fact is no longer employed by the Company.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of the date written below.

Date: March 10, 2022

By: /s/ John S. Wirt
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   John S. Wirt