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 People are turning themselves into lab rats': the injectable peptides craze sweeping the US Well actually The Guardian Unauthorized injectable peptide drugs seized and sold by Canada Peptide may pose serious health risks Canada.ca The U.S. Food and Drug Administration is moving toward allowing compounding pharmacies to produce more than a dozen injectable peptides that were banned because of potentially significant safety risks, the New York