BPC 157: Miracle Healing Peptide or Hidden Danger? All the hype about peptides But what are they actuallyand have they really been tested in humans for muscle building or tendon regeneration? We took a deep dive into the literature Peptide BPC 157 Does It Work? Breaking Down the Evidence and the Hype 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.