In 2023, the FDA deemed 19 peptides too unsafe to be dispensed by compounding pharmacies. Now, under RFK Jr., the agency is poised to reverse itself despite the fact that few 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 Demand for Unapproved Weight Loss Drug Surges on Social Media MedPage Today Deep Dive: Regulatory Status of Popular Compounded Peptides Holt Law Regulatory Alert: FDA's April 2026 Update on BPC 157 and GHK Cu Holt Law