Stanozolol (also known as Winstrol) 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 Laboratories to increase lymphocyte count and CD8+ cell numbers, but to decrease CD4+ and CD3+ in postmenopausal women using it for osteoporosis. This effect would plausibly be useful for treatment of autoimmune disorders. Winstrol is useful in treatment of hereditary angioedema. It also influences some immunological processes.

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