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That's because semaglutide was originally developed using biological processes, but the generic versions can be made using more simple chemical means

Capezzuoli T, Vannuccini S, Mautone D, Sorbi F, Chen H, Reis FM, et al

References PubMed Thymosin beta 4 accelerates wound healing (Philp et al., 1999) PubMed Thymosin 4 promotes dermal healing in preclinical models and clinical trials PMC Emerging use of BPC-157 in orthopaedic sports medicine: systematic review PMC Pharmacokinetics, distribution, metabolism, and excretion of BPC-157 in rats and dogs PMC PepT1-mediated tripeptide KPV uptake reduces intestinal inflammation