Testosterone is a critical hormone in the body. “In men, it’s thought to regulate sex drive (libido), bone mass, fat distribution, muscle mass and strength, and the production of red blood cells and sperm,” says the National Institutes of Health (NIH). Furthermore, testosterone is responsible for the deep voice in men, facial hair, improves mood, and aids in cognition. It's mainly produced by the testicles, but small amounts are made in the adrenal glands as well.
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