Stable Gastric Pentadecapeptide BPC 157 and Striated, Smooth, and Heart Muscle BPC 157 Plano, TX Metamorph Med Spa I've been using Pentadecapeptide (PDA) and the results have been unreal. this peptide is almost identical to BPC 157 with the exception of an additional marginate salt, which has contributed to Gel injections for the knee involve the injection of a gel like substance into the knee joint to provide lubrication and cushioning. This treatment is often used to alleviate pain and improve mobility