Americans are injecting themselves with unproven peptides 6abc Philadelphia BPC 157: Miracle Healing Peptide or Hidden Danger? FDA Form 1572: What It Means & Who It Includes 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 On August 15 2025, the U.S. Food & Drug Administration (FDA) issued a Warning Letter to Platinum Biologics LLC for marketing umbilicalcordderived products including exosome products (NanoEx & Nano Xsomes) without approval. FDA Sends Warning Letters to More Than 50 GLP 1 Compounders and Manufacturers Wilson Sonsini