BPC-157 tendon work was in rats
A 2003 study used rats with surgically transected Achilles tendons and cultured tendon cells. The authors reported better biomechanical, functional and tissue measures with BPC-157 than saline. Animal and cell findings are hypothesis-generating, not evidence that it heals human tendons.
BPC 157 in transected rat Achilles tendon and cultured tendocytes (2003)