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 . 
It may sound like the name of a fancy herb, but avena sativa is simply the scientific term for oats. Taking an avena sativa extract, however, isn't at all like enjoying a hot bowl of oatmeal. Avenocosides, the active components in oats that are similar to the testosterone-boosting saponins in the herb tribulus terrestris, help increase the release of LH from the pituitary gland in the brain, which in turn influences the testicles to produce more testosterone.
How to take it: Look for products that supply about 100-300 mg of a 10:1 avena sativa extract. Take one dose of this extract 2-3 times per day with one of those doses about 30-60 minutes before workouts. As with vitex agnus castus, take avena sativa products in 6-8-week cycles with four weeks of downtime between each cycle.