Testosterone is an important male sex hormone produced in the testicles. It regulates sexual development, muscle density, and bone growth. It also ensures that the body makes enough red blood cells. When the brain receives signals that testosterone levels in the blood are low, it triggers a cascade of actions to produce more of the hormone.
Around 95% of testosterone is made in the testicles with the remaining 5% produced by the adrenal glands.
The body has its own feedback mechanisms. When testosterone levels get too low, it ramps up production of the hormone. When levels of the hormone are too high, the body blocks further production of testosterone.
Women produce relatively small quantities of testosterone. But the hormone is nevertheless an important precursor for estrogen and helps to regulate muscle mass, mood, and libido.
In women, testosterone is produced predominantly in the ovaries and adrenal glands. Similar to men, the production of the hormone is set in motion by signalling via the luteinizing hormone.
Both men and women can have abnormally low or high levels of testosterone. In some cases, these conditions may require blood testing and treatment.
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