It is often said injectable Winstrol is far more powerful than its oral counterpart, and based on the increased enhancement of nitrogen retention this would support such a belief; however, it's not as cut and dry as you might think. Yes, injecting Stanozolol will increase nitrogen retention beyond what the oral tablet can; however, this increased enhancement is not that significant over the oral form; you can truly obtain the same results with either one. Another myth that often plagues injectable Winstrol surrounds its structural nature, most understand the oral tablet is a C17-aa steroid and assume the injectable form does not carry this hepatotoxic nature; they would be incorrect. Injectable Winstrol is one of the few injectable steroids that is a C17-aa anabolic steroid, and while its hepatotoxic nature is not quite as strong as the oral tablet it is still rather high; in-fact, both forms of Winstrol are some of the most hepatotoxic steroids on the market.
The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine .