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 What are peptides? The treatments promising weight loss and better skin, explained Vox Have you thought about taking peptides that aren't approved by the FDA? Think again. CBS News' chief medical correspondent, @drlapook, shares a cautionary tale from medical history about why testing medications is 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 BPC 157 for athletes and injury treatment: Science, safety, and legal concerns