BPC-157
A 15-amino-acid peptide first identified as a fragment of a protective protein in gastric juice. Research has studied its role in tendon, ligament, muscle, and gut-lining repair — though most of that evidence comes from animal studies rather than large human trials, per a 2025 review in Current Reviews in Musculoskeletal Medicine. Among athletes and active adults it's most often used to support recovery from training and soft-tissue injury. Individual results vary.