Testosterone is the prime male androgen in the body, and as such still the best possible mass builder in the world. Testosterone enanthate is an oil based injectable steroid, designed to slowly release testosterone from the injection site (depot). 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. While not always the most visually appealing result, there is no steroid on earth that packs on mass like testosterone does.
Although this particular ester is active for a much longer duration, most prefer to inject it on a weekly or bi-weekly basis in order to keep blood levels stable. The usual dosage would be in the range of 250mg-750mg a week. This level is quite sufficient, and should provide the user a rapid gain of strength and body weight.