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Note that with this method of delivery absorption occurs predominantly in the stomach to achieve therapeutic plasma levels, and overcomes otherwise insurmountable challenges of peptide absorption related to solubility, molecular size, and enzymatic degradation in the protease-rich environment of the small intestine (Buckley et al, 2018)
mechanism unexplained Relative contributions of direct peptide effects versus downstream IGF-1 actions inadequately characterized Long-term receptor sensitivity and potential for desensitization inadequately studied Individual patient variability in response not well-characterized Potential for differential effects based on endogenous growth hormone status unclear Long-Term Safety Considerations Critical safety questions remain unanswered regarding chronic peptide administration: Cardiovascular safety concerns FDA warnings cite risks of increased heart rate, systemic vasodilation, flushing, and transient hypotension Immunogenicity risks FDA identifies both peptides as potentially immunogenic with risk of serious immune reactions including anaphylaxis Cancer risk theoretical concern that chronic growth hormone/IGF-1 elevation could promote cellular proliferation
A systematic review pooling data from 27,617 patients found that semaglutide use lowered MACE risk by 19% overall (RR 0.81)
Gan, J., Harper, T
