What Peptides Are Legal in the U.S.? Understanding FDA Approval, Compounding, and the Legal Gray Areas Peptide Therapies in 2025: What's Legal, What's Experimental, and What Empire On Demand The science behind the peptide craze Scientific American In 2023, the FDA deemed 19 peptides too unsafe to be dispensed by compounding pharmacies. Now, under RFK Jr., the agency is poised to reverse itself despite the fact that few The Human Lab Rats Injecting Themselves with Peptides Office for Science and Society McGill University