Winstrol is the most widely recognized trade name for the drug stanozolol. Stanozolol is a derivative of dihydrotestosterone and is classified as an “anabolic” steroid and it cannot be aromatized into estrogens. Winstrol is the second most widely used oral steroid, succeeded in popularity only by Dianabol. It is favored for its ability to promote muscle growth without water retention making it highly valued by dieting bodybuilders and competitive athletes. Stanozolol is widely available in both human and veterinary drug markets. Composition and dosage may vary by country and manufacturer. Even that Stanozol is not aromatized by the body and is not highly estrogenic it is known to strongly suppress levels of SHBG. An anti-estrogen is not necessary when using this steroid while gynecomastia should not be a concern even among sensitive individuals. Winstrol is very popular among athletes in combination with strength/speed sports such as track and field wherein in such disciplines one usually does not want to carry an excess water weight.