FDA Sends Warning Letters to More Than 50 GLP 1 Compounders and Manufacturers Wilson Sonsini The FDA just put peptides like BPC 157, TB 500, and KPV on the clock. , As a compounding pharmacist, this is literally my world and most people dont understand the regulatory nuance behind what Hims & Hers stock rises 14% as FDA schedules peptide compounding review 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