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 . 
But if they took 15 mg of Dianabol a day for five weeks -- Mix says it might have been three weeks, Shea says six -- it could have given them an advantage, especially if none of their opponents was using. Victor Conte, the BALCO mastermind, says a cycle of that size and length could have given them benefits for "four months or longer." But Charles Yesalis, professor emeritus of health policy and administration at Penn State University and a leading expert on doping, says such doses of Dianabol might have given the players a boost for only up to two months.
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