Winstrol also know as Stanozolol is a 17-alpha-alkylated derivative of dihydrotestosterone (DTH) with low androgenic qualities yet highly anabolic. Winstrol can add to mass gains but more usually is used for cutting, herdening, or increasing speed or strenght without necessarily increasing muscle mass. Winstrol does not convert to estrogen, as a result winstrol does not cause water retention. On the contrary, it is possess a diuretic effect. So, instead of a bulk look winstrol produces a lean quality look without excess subcutaneous water retention.