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 and Healing Peptides: Hype or Hope? A Doctor's Comprehensive Perspective MSK Doctor Zaid Matti Would you take a drug tested only in rats? The evidence in humans for the safety and efficacy of BPC 157 is EXTREMELY limited. People need to understand what we do and don't BPC 157 is one of the peptides that has been getting a lot of attention recently. It is a synthetic peptide derived from a protein found in human gastric juice. In experimental research,