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 . 
Durabolin (Nandrolone)® is a muscle enahancer that is very needed in cutting and bulking cycles. Oregon Labs brand is called Dura 50 which helps you keep the muscle that you gained after a cycle. This product is a must for those seeking pure muscle build-up and a more solid look. You will be very pleased with Dura-50 caps. Novices and less advanced achieve rapid strength and pure muscle gain quick. Dura 50 causes the muscle cell to store more nitrogen than it releases so that a positive nitrogen balance is achieved.