Stanozolol is a 17-alpha-alkylated derivative of dihydrotestosterone(DHT) with low androgenic qualities yet highly anabolic. It was first developed in 1962 by American global pharmaceutical company Sterling-Winthrop Labsoratories to increase lymphocyte count and CD8+ cell numbers,but to decrease CD4+ and CD3+ in postmenopausal women using it for osteoporosis