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 . 
Deer antler velvet has made its way into the spotlight recently thanks to claims that Super Bowl winner Ray Lewis used it in spray form to recover from his October triceps injury. Lewis denied the claim, but had many people wondering if deer antler velvet, a substance that is banned by the NFL and claims to increase strength and boost muscle recovery, really works. The natural supplement, made from the fuzz that covers male deer antlers, is a growth hormone known as IGF-1, which supposedly can repair cartilege damage and increase strength and muscle mass.