Testosterone is the hormone that gives you “male characteristics.” It triggers the changes in your body that happen when you’re an adolescent, such as when your voice gets deeper, when you grow taller, when you grow more facial and body hair. Testosterone continues to work throughout your adult life by helping to maintain your sex drive, muscle strength and mass, sperm production, fat distribution, and sexual potency.
It is estimated that 4 to 5 million men in the United States may have testosterone deficiency associated with hypogonadism.
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