Only a handful of the peptides people research are actually FDA-approved drugs. The rest are sold as research chemicals or compounded products, which is a different regulatory category. Knowing which is which is one of the clearest ways to gauge how much human evidence sits behind a compound.
Reviewed for accuracy · Last reviewed July 7, 2026These have approved labels, defined doses, and the human trial evidence that approval requires. Approval is for a specific indication, so use outside that indication is still off-label.
Many widely discussed peptides are not FDA-approved and are sold as research chemicals or compounded preparations. Their evidence base ranges from limited human data to animal-only studies, and product purity is not guaranteed the way it is for an approved medicine.
Retatrutide is a notable in-between case: it is investigational, with published Phase 2 trial data, but no approval yet. Sermorelin is another edge case, formerly approved as Geref and later discontinued commercially, so it is now used as a compounded product.