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 Unauthorized injectable peptide drugs seized and sold by Canada Peptide may pose serious health risks Canada.ca FDA's Overreach on Compounded Peptides BPC 157: The Real Reason Why It's Not FDA Approved Stracuzzi Wellness FDA Is Expected to Lift Restriction on Peptides, Heeding RFK Jr.'s Wishes The New York Times