Retatrutide, the most powerful weight-loss drug in development, is not expected to hit the U.S. market before next year, at the earliest. But Adil Kalam, a 37-year-old in Brooklyn, already has 20 vials of it in his freezer. 瑞他鲁肽是目前研发中最强效的减肥药，预计最早也要到明年才能进…