FDA releases denial letters for unapproved drugs, a step toward transparency FDA Puts BPC 157, TB 500, and 5 Other Peptides Under the Microscope: What Prescribers Need to Know About the 503A Review Lengea BPC 157: Miracle Healing Peptide or Hidden Danger? BPC 157: Miracle Healing Peptide or Hidden Danger? 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