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IGF-1 is the second signal that drives most of the effects people link to GH muscle protein building, fat metabolism, and tissue repair

They have not been evaluated by the FDA for safety, efficacy, or quality

Class B1 GPCRs bind their peptide agonists via a two-domain model, whereby the C-terminus of the peptide interacts with the receptor extracellular N-terminal domain (ECD) promoting an affinity trap that enables the engagement of the N-terminus of the peptide with the receptor transmembrane domain (TMD), with interactions with the TMD required for receptor activation 9

Robust Phase 2/3 studies are still lacking and most of the evidence remains preclinical