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 . 
Testosterone is considered an essential absolute base to any cycle due to the fact that Testosterone is the body’s natural anabolic androgen. It also serves as an all-round excellent mass building compound that is suitable for bulking and strength gaining, and can also be utilized for the purpose of cutting and fat loss as well. In order to carry results further, other bodybuilding steroids are combined with (or “stacked” with) Testosterone. Some of the most popular anabolic steroids in this regard are compounds such as Dianabol (Methandrostenolone) , Winstrol (Stanozolol) , Nandrolone (Deca-Durabolin), and Trenbolone , among a few others. These Dianabol and Winstrol are two examples of oral bodybuilding steroids, though Winstrol does also come in an injectable format that is chemically identical to the oral, and thus even the injectable Winstrol can be ingested orally in order to garner the same effects as the tablet format. Oral anabolic steroids are generally regarded as bodybuilding steroids that are supplementary adjuncts to a solid base anabolic steroid cycle involving injectable bodybuilding steroids (namely, Testosterone).