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Men's Health

Testosterone Directory

Testosterone is a hormone that acts as the primary sex hormone in men. It is produced by the male testicles and the female ovaries. Testosterone levels in men increase during and after puberty, dropping again after about age 40. Testosterone causes the deeper voice, bigger muscles, body hair, and other primarily male features. Follow the links below to find WebMD's comprehensive coverage about what testosterone is, what it does in the body, what levels are normal, and much more.

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Thumbnail: How Low Testosterone Affects Your Health

When levels of this male hormone drop, you won't just have sexual problems. It can also affect your mood, weight, and concentration.

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