Sources: U.S. Food and Drug Administration (FDA) Compounding and the FDA (503A & 503B guidance) FDA warning letters on unapproved peptide products National Institutes of Health (NIH) PubMed FDA Moves to Reevaluate Several Peptides American Med Spa Association What are peptides? FDA may ease restrictions on unproven health fad LiveNOW from FOX The Human Lab Rats Injecting Themselves with Peptides Office for Science and Society McGill University