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 Peptides are getting treated like a cheat code online. That is usually where the conversation goes sideways. Because once something gets labelled the Wolverine stack, people stop asking better questions. Multifunctionality and Possible Medical Application of the BPC 157 PeptideLiterature and Patent Review BPC 157: Experimental Peptide Creates Risk for Athletes