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These substitutions include changes of the N-terminal histidine (H) residue of GLP-1 1-37 to asparagine (N) in Loxodonta africana (African elephant) and Ofer afer (aardvark) and glutamine in Elephantulus edwardii (Cape elephant shrew)
Aslam B, Bin Zafar MD, Changez MIK, Abdullah M, Safwan M, Qamar B, et al
The following sources give you the unfiltered picture - clinical evidence, regulatory context, and safety data straight from the organizations that publish it: FDA.gov - official FDA communications on compounded semaglutide, tirzepatide, and the 503B Bulks List proposal (April 30, 2026)
Tirzepatide (Mounjaro, Zepbound) is a dual GIP/GLP-1 agonist