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 . 
When first administering steroids, a man will have an increase in sexual function. This unfortunately is only temporary as your body becomes used to the steroid in its system. With prolonged use of a steroid, eventually, the man will feel less sexual desire, and will be less capable of maintaining an erection. Luckily, this is only temporary as well and can even be totally prevented with the use of substance such as Gonakor and HCG. Also when the steroid use is discontinued, the body’s natural level of testosterone (like the immune system) will certainly be suppressed.
Depending on the individual goals a beginner will find comfortable Turinabol doses in the range of 15 – 30mg per day, although this is considered a low dose range where gains will not be exceptionally dramatic by any means. Such a Turinabol dose would provide noticeable but steady lean gains and almost nothing in the way of unwanted side effects except for those most sensitive. Intermediate users would find greater progress in the way of strength and mass gains upwards of 30 – 50mg per day with still very low incidences or chances of unwanted side effects. Advanced Turinabol doses land in the range of 50 – 80mg per day sometimes higher which would of course provide more dramatic strength and mass gains but at the expense of increased androgenic side effects at such an increased Turinabol dose. In general most users find satisfactory results in the middle of the total previously mentioned doses, which would be around 50mg per day. Doses lower than 40mg per day tend to be utilized merely for the preservation of lean mass during fat loss and cutting phases.