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 . 
The assumption that Nina is on steroids is flawed, knowing what PEDs & HGH do the evidence doesn't support it. Best guess is if anything she stopped taking anything at all (meaning female hormones) and has thru diet and exercise sculpted what we see today. I like it, too many of my favorites look sloppy today because they rely solely on hormones and their midsections look horrible. Nina looks great and will do so for a long time because she works her ass off to do so. So haters shut up and read a damn book before you say something stupid next time!