Peptides BPC 157 promise to help heal and recover you from injuries and tough workouts (and do way more than that sometimes too!). But there's limited research into their effectiveness. So how do BPC 157 has already hit the mainstream, but should it hit your bloodstream? NO system dependence of atropine induced mydriasis and L NAME and L arginine induced miosis: Reversal by the pentadecapeptide BPC 157 in rats and guinea pigs ScienceDirect BPC 157: Miracle Healing Peptide or Hidden Danger?