https://apnews.com/106808694cb797a59db366df54e85692 > WASHINGTON (AP) — Hundreds of clinics pushing unproven stem cell procedures caught a big break from the U.S. government in 2017: They would have three years to show that their questionable treatments were safe and worked before regulators started cracking down. > But when the Food and Drug Administration's grace period expired in late May — extended six months due to the pandemic — the consequences became clear: Hundreds more clinics were selling the unapproved treatments for arthritis, Alzheimer’s, COVID-19 and many other conditions.