BPC 157: Miracle Healing Peptide or Hidden Danger? Which non FDA (United States Food and Drug Administration) approved peptides, such as BPC 157 (Body Protection Compound 157) and TB 500 (Thymosin Beta 500), are likely legitimate for medical use under strict supervision? RFK Jr. promotes peptides. Now the FDA weighs easing limits on the unproven chemicals Peptide BPC 157 Does It Work? Breaking Down the Evidence and the Hype