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 I spent 4 months reporting on the peptide BPC 157 and its unlikely journey from a research lab in post communist Croatia to today's MAHA movement. Ask me anything. : r IAmA Mixing Medications and Dietary Supplements Can Endanger Your Health FDA The Human Lab Rats Injecting Themselves with Peptides Office for Science and Society McGill University The peptide problem: Hype is outrunning the evidence