Exhibit 23.3

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated August 5, 2024 with respect to the financial statements of Peak Bio, Inc. for the years ended December 31, 2023 and 2022 included in the Annual Report on Form 10-K.

/s/ Marcum LLP

New York, NY

July 29, 2025