Testosterone enanthate is an ester of the naturally occurring androgen, testosterone. It is responsible for the normal development of the male sex characteristics. In the event of insufficient testosterone production an almost complete balance of the functional, anatomic, and psychic deficiency symptoms can be achieved by substituting testosterone. One of the many testosterone substances is the testosterone enanthate. In a man it is normally used to treat hypogonadism resulting from androgen deficiency and anemia. Surprisingly, in medical schools testosterone enanthate is also used in women and children. Boys and male youth take it as growth therapy. In bodybuilding, however, it is THE “mass building steroid.” No matter what you think of Dianabol, Parabolan, Anadrol 50, Finaject, and others, when it comes to strength, muscle mass, and rapid weight gains, testosterone is still the “King of the Road.” Testosterone enanthate is the European counterpart to Testosterone cypionate which is predominantly available in the U.S. Testosterone enanthate, as most trade names already suggest, is a long-acting depot steroid. Depending on the metabolism and the body’s initial hormone level it has a duration of effect of two to three weeks so that theoretically very long intervals between injections are possible. Although Testosterone enanthate is effective for several weeks, it is injected at least once a week in bodybuilding, power lifting, and weightlifting. This, by all means, makes sense since Testosterone enanthate has a plasma half-life time in the blood of only one week.