BPC 157 Peptide Hormone Replacement Therapy Los Angeles 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. The Peptide Craze Ground Truths TB 500 Thymosin Beta 4 Research: Cardiac Cell Model and A I'm self experimenting with Peptides. Dr. Marcus Ranney