Q&A: Do men need extra testosterone?

My husband's doctor prescribed topical testosterone after a blood test showed a low level of the hormone. But we're concerned about possible side effects. Who really needs extra testosterone? —T.L., Hamilton, Ontario, Canada

Most men don't. Even if your husband's testosterone level is below normal, he should consider supplemental doses of the hormone only if he also has signs of deficiency, notably a bothersome decline in libido and potency, a loss of facial or body hair, or osteoporosis before age 65—and only after ruling out or treating possible underlying causes of low testosterone, such as a pituitary or testicular disorder. There's good reason to skip testosterone if he can. Side effects may include blood clots, breast enlargement, decreased sperm production, worsening cholesterol levels, and possibly an increased risk of prostate enlargement or cancer. And the risks of taking testosterone long-term remain largely unknown.

Visit our Men's Health Center for more on conditions and treatments for men.