The Human Lab Rats Injecting Themselves with Peptides Office for Science and Society McGill University 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 to weigh easing limits on unproven peptides favored by RFK Jr. and MAHA supporters PBS News What are peptides? The treatments promising weight loss and better skin, explained Vox