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[DOI] [PMC free article] [PubMed] [Google Scholar] Strickland M

Variants in genes encoding the GLP-1 receptor (GLP1R rs6923761) and other peptide-pathway genes can affect receptor sensitivity and signaling efficiency, which may explain why some patients tolerate semaglutide easily while others experience more pronounced symptoms

A researcher in 2026 must choose: work on native peptides (ease of SPPS synthesis, abundant literature) or optimised mimetics (better pharmacokinetics, but complex synthesis, less literature)

Sourcing pressure has tightened following Health Canadas 2025 and 2026 advisories naming BPC-157 among unauthorized injectable peptides seized from Canadian sellers