Testosterone enanthate is an oil based injectable steroid, designed to release testosterone slowly form the injection site. Once administered, serum concentrations of this hormone will rise for several days, and remain markedly elevated for approximately two weeks. It may actually take three weeks for the action of this drug to fully diminish. Testosterone is a powerful hormone with notably prominent side effects. Much of which stem from the fact that testosterone exhibits a high tendency to convert into estrogen. Adding an ancillary drug like Nolvadex and or proviron is therefore advisable to those with a know sensitivity to this side effect. The Anti-aromatase Arimidex and Aromasin are stronger drugs to eliminate estrogen further, if gyno has started to form ..there is an even stronger compound 'letrozole'.. which has been known to shrink gyno growths behind the nipple ....but be warned , this is a potent drug and should only be used if necessary. This particular Testosterone ester is active for a much longer duration than Testosterone Propionate. Athletes use testosterone enanthate because they prefer to inject it on a weekly basis for convenience and less injections. The usual dosage would be in the range of 250mg-750mg. This level is quite significant and should provide the user a rapid gain of strength and body weight. Estrogenic side effects will no doubt become much more pronounced above this level outweighing any new muscle that is possibly gained. Those looking for greater bulk should be better served by adding an oral like Anadrol 50 or Dianabol. These combinations prove to be nothing less than dramatic. If the athlete wishes to use a testosterone yet retain a level of quality and definition to the physique, an injectable anabolic like Deca-durabolin or Equipoise may prove to be a better choice. Here we can use a lower dosage of enanthate, so as to gain an acceptable amount of muscle but keep the build up of estrogen to a minimum. Producing too much water (and fat) retention can make more hard work when dieting down to get lean or compete for a competition..therefore keeping estrogen in check to a degree is a good idea. Doses of between 200-600mg per week is the range most work in ,doses up to 1000mg per week of testosterone are commonly used, but the possible side effects can outweigh any extra benefits,..therefore this puts most users off going that high.