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The FDA signaled escalating enforcement, and on April 30, 2026, it proposed excluding semaglutide, tirzepatide, and liraglutide from the 503B outsourcing facility bulks list - the mechanism that governs which substances large-scale compounders may use - with a public comment period open through June 29, 2026
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Amino acid substitutions : Specific amino acids within the peptide backbone are reported to have been substituted or modified to improve resistance to enzymatic degradation, including by dipeptidyl peptidase-4 (DPP-4), thereby improving metabolic stability
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speakers bureau and consulting fees from Amgen, Aegerion, Sanofi, and Regeneron until April 2019 (fees paid to the academic institution)
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