A man with shrinking levels of testosterone actually may lose some body hair. Testosterone replacement therapy comes with a few potential side effects, including acne and breast enlargement. Testosterone patches may cause minor skin irritation. Topical gels may be easier to use, but great care must be taken to avoid transferring testosterone to someone else though skin-to-skin contact.

Hallie Levine is an award-winning magazine and freelance writer who contributes to Consumer Reports on health and fitness topics. Her work has been published in Health, Prevention, Reader's Digest, and Parents, among others. She's a mom to three kids and a fat but feisty black Labrador retriever named Ivry. In her (nonexistent) spare time, she likes to read, swim, and run marathons.

Once your elevate testosterone levels, you will also sharpen your focus, enhance sports performance, and enjoy enormous competitive spirit. You will also soon notice that the lack of motivation is no longer your problem. Being highly motivated and aggressive due to the action of testosterone boosters, you will experience better muscle gain. Whether you are a novice or a professional sportsman, you will quickly reach your sports goals.

Hypogonadism is a disease in which the body is unable to produce normal amounts of testosterone due to a problem with the testicles or with the pituitary gland that controls the testicles. Testosterone replacement therapy can improve the signs and symptoms of low testosterone in these men. Doctors may prescribe testosterone as injections, pellets, patches or gels.

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