Stanozolol, commonly known as Winstrol, is a synthetic anabolic steroid that is derived from testosterone. Winstrol is both an anabolic and androgenic hormone, which means that it promotes muscle growth and development while also causing virilizing effects in females. Although once widely available on the market, stanozolol is now difficult to find due to increased regulation. Despite the hype online about Winstrol being readily available for purchase, there have been many instances of fake formulations or contaminants being found in products bought from untrustworthy sources. The lure of easy money has gotten many people in the business of selling counterfeit anabolic steroids online.