WASHINGTON (AP) — Unapproved peptide drugs have become a trendy new hack among wellness influencers , fitness coaches and celebrities, pitched as a way to build muscle, shed pounds and look younger. Online stores will offer injectable vials for $300 to $600 each. Longevity and wellness clinics offer in-office evaluations and injections, sometimes with membership fees of thousands of dollars per month. But many of the products have never been extensively studied in humans, raising concerns that