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 Frontiers Pharmacokinetics, distribution, metabolism, and excretion of body protective compound 157, a potential drug for treating various wounds, in rats and dogs BPC 157 has already hit the mainstream, but should it hit your bloodstream? BPC 157 Supports Recovery, Gut Health & Regeneration Peptide Therapy for Pain Management and Healing Core Medical & Wellness Can you inject peptides into the knee?