Peptides BPC 157 promise to help heal and recover you from injuries and tough workouts (and do way more than that sometimes too!). But theres limited research into their effectiveness. So how do you BPC 157: Miracle Healing Peptide or Hidden Danger? That 1% difference in peptide purity? It's not just a number on a spec sheet. When you're running sensitive assays or dose response studies, even trace impurities can throw off your results. We're Peptides are surging in popularity. There's little evidence that they work.