Dr. TLDR: BPC 157 has not been proven to cause cancer. But it has also not been proven safe in people with active cancer, recent cancer, premalignant conditions, suspicious lesions, or high BPC 157: Experimental Peptide Creates Risk for Athletes 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 Frontiers Stable Gastric Pentadecapeptide BPC 157 and Wound Healing Gastric pentadecapeptide body protection compound BPC 157 and its role in accelerating musculoskeletal soft tissue healing Cell and Tissue Research Springer Nature Link