BPC 157: Experimental Peptide Creates Risk for Athletes BPC 157: Experimental Peptide Creates Risk for Athletes BPC 157 has already hit the mainstream, but should it hit your bloodstream? Is BPC 157 Legal? Understanding Its Status and Implications Have you used peptides? What are your thoughts? Let me know below Peptides are short chains of amino acids that play vital roles in cellular signaling and repair throughout the body.