Testosterone Decanoate, with a half life of more than 2 weeks, is one of the longest lasting esters used in steroidsfor the enhancement of muscle size and strength. The endocrine and metabolic effects of long term (a.g. for several weeks to years) administration of testosterone decanoate are generally well described by the following:1. An increase in T levels (mainly via Tandrol-sulfate ester formation) may result in the production of a strong, almost constant, hormonal secretion (see below), cypionate half testosterone life.2. There may be a greater degree of "acute" or short-term responses of T and other hormone to high doses.3, testosterone cypionate half life. Protoporphyrin (the adrenergic hormone responsible for the suppression of T production by testosterone glucuronide) and norepinephrine may be present in substantial amounts, possibly increased and a potent stimulant, as observed clinically with chronic or sub-clinically administered (and therefore long lasting) diltiazem.4. The most common side effects of testosterone in men are erectile dysfunction (particularly in heavy users of testosterone), impotence, hyperandrogenism, acne, and skin lesions.