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Because brand-name pens are manufactured only in standard doses, microdosing previously relied on compounded formulations: custom preparations made by specialty pharmacies, a practice that became common during shortages of GLP-1s declared by the Food and Drug Administration (FDA) in 2025
M., Metcalfe, C., Refsum, H., Lewis, S
Semaglutide is a GLP-1 agonist, meaning it mimics the peptide hormone GLP-1
Interestingly, in echidna GLP-1 there is less conservation of the receptor binding residues with additional changes at the N-terminal receptor binding Phe 12 (conservatively substituted to Tyr) and Asp 15 (changed to Glu) residues
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