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What is Winstrol Winstrol is the trade name for stanozolol — a synthetic anabolic-androgenic steroid derived from dihydrotestosterone (DHT). It belongs to the group of 17α-alkylated steroids and was initially designed for veterinary use, later adapted for human applications. The injectable version in 50 mg ampoules represents an aqueous suspension standardized for intramuscular administration. Compared to vial-based preparations, ampoules ensure sterility and precise dosing, reducing the ris..