What is Winstrol steroid? Winstrol steroid is the brand name for the anabolic steroid Stanozolol. It is a synthetic steroid derived from dihydrotestosterone (DHT), and it was first developed in the 1960s by Winthrop Laboratories. Winstrol is known for its anabolic effects, which can increase muscle mass, fuerza, y resistencia. It is commonly used by bodybuilders and athletes to improve their …