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1. Testosterone is a hormone that is produced in the testicles.
2. It is responsible for the development of male characteristics such as facial hair and a deep voice.
3. It also plays a role in sperm production and the development of muscles and bones.
4. Testosterone levels typically peak during adolescence and early adulthood.
5. After age 30, levels of testosterone begin to decline about 1% each year.
6. Low testosterone levels can cause a variety of symptoms, such as low sex drive, fatigue, and depression.
7. There are a number of ways to increase testosterone levels, such as weightlifting, getting enough sleep, and taking supplements.
8. Certain medical conditions can also cause low testosterone levels, such as hypogonadism and Klinefelter syndrome.
9. Testosterone replacement therapy is a treatment option for low testosterone levels.