It's a long-acting form of testosterone, often sold under brand names like Nebido® or Aveed.
Medical Use: Its only approved use is as testosterone replacement therapy (TRT) for men diagnosed with hypogonadism, a condition where the body doesn't produce enough testosterone.
How it's given: It's administered as a deep intramuscular injection, typically every 10 to 14 weeks.
Key characteristic: It has a very long half-life of approximately 3 months. This means it stays in your body for a long time, making side effects difficult to manage if problems arise.
Can It Build Muscle?
Yes, testosterone is an anabolic steroid that promotes muscle growth. Studies show it can be effective, particularly when combined with resistance training. However, this evidence comes from controlled medical studies, not from bodybuilding use.
For instance, one study on older men (55-70 years) found that a short course of testosterone undecanoate combined with resistance training significantly increased lean body mass.
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