FDA Moves on Peptides: What Compounding Pharmacies Need to Know 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? 'People are turning themselves into lab rats': the injectable peptides craze sweeping the US Well actually The Guardian Warning: BPC 157 is a synthetic peptide and an unapproved drug, often promoted with misleading claims. It is prohibited and on the DoD Prohibited Dietary Supplement Ingredients List. Don't gamble with your FDA Targets GLP 1 and Peptide Compounding, Advertising and 'Research Use Only' Labeling Some peptides are FDA approved drugs. Some are legal supplements. Some are neither. The same word, peptide, covers all three categories. The regulatory status of the specific compound is what determines legality.