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 . 
Hey Ben. I am stymied by those last 5 pounds or so around the middle that are so dang hard to get rid of. I was up around 265 about a year ago, cleaned up my eating habits, and starting exercising like crazy, and went down almost 100 pounds in less than 5 months, and have put on about 15 pounds of muscle in the last year or so. The problem, though, is I STILL cannot get rid of that last few pounds of fat around the waist and belly button, no matter, what I do, low carbs, HIIT, intermittent fasting(though this helps me maintain my weight about 175), and sprinting. It just will not go away! What is it, am I just too damn old to get in righteous shape any more, or what? (I am 58). I have improves my musculature and general health to the point that my blood pressure went from 185/98 to 122/65, and my waist size went from about 46 inches back down to the 32 inches I used to be about 30 years ago. But this slight roll of flab around the belly just kicks my butt! I still do whole body workouts 3 or 4 times per week, and have cut out most sugar, all fried foods, potato chips, soft drinks, and fast foods, as well as processed foods. I cook most everything I eat myself, except for a meal out at a good-quality restaurant one time per week. I only drink water, unsweetened tea, almond milk, unsweetened also, and coffee now and then. Any suggestions will earn you my undying gratitude.