BPC 157 has already hit the mainstream, but should it hit your bloodstream? BPC 157 Erectile Dysfunction: What the Evidence Shows and Practical Considerations BPC 157 Ligament: 1 Unsafe Truth Therapeutic Peptides in Aesthetic, Metabolic and Endocrine Conditions: Effects, Safety, Clinical Applications, and Future Perspectives 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.