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 Internet famous peptides like BPC 157 and TB 500 might be the future, but right now they're a shot in the dark. Peptides like BPC 157 are everywhere on social media right now. They are most commonly promoted for injury and tendon healing and are often paired with other peptides such as TB 500. Is BPC 157 Immune System Support Really Effective? LIVV Natural