Is testosterone a controlled steroid substance?
As the most important androgen, testosterone is a steroid hormone that stimulates the development of male secondary sexual characteristics, produced mainly in the testes. In males, 95% is secreted by the testicles, with a small amount (5%) also coming from the adrenal glands. A mature male secretes between 4 and 10 mg of testosterone per day. In females, small amounts of testosterone are also secreted by the adrenal glands and ovaries. Other than having natural levels of testosterone, synthetic testosterone may be ingested to enhance performance and are often used by bodybuilders, athletes and other sports people.
