Arimidex Bodybuilding Overview Arimidex Bodybuilding is a pharmaceutical-grade aromatase inhibitor (AI) used by competitive athletes and bodybuilders to control estrogen levels during anabolic steroid cycles. It helps prevent water retention, gynecomastia (gyno), and fat gain caused by elevated estrogen—keeping your gains lean and defined. Benefits Blocks estrogen conversion from testosterone Prevents gynecomastia and bloating Improves