The half-life of testosterone decanoate, a long-acting ester of testosterone, can vary depending on factors such as the individual's metabolism, the specific formulation of the compound, and the method of administration. In general, the half-life of testosterone decanoate is estimated to be approximately 7 to 12 days.
Testosterone decanoate is one of the many esterified forms of testosterone used in hormone replacement therapy (HRT) and anabolic steroid preparations. Due to its relatively long half-life, it is administered less frequently than shorter-acting testosterone esters like testosterone propionate.