Steroids are used to increase muscle strength. Yet they also can damage the liver, increase cholesterol, and stop production of testosterone. And they can cause personality changes. Steroid users may become angry for no reason. Some become dependent on steroids and feel they cannot live without them. Users can become depressed and, in some cases, may even want to take their own life. Some men who use anabolic steroids develop breasts and their reproductive organs shrink. Some women develop a deeper voice and grow facial hair.

BOB DOUGHTY: Testosterone is a steroid hormone. Hormones are chemicals that help keep the body working normally. The effects of testosterone can be seen in boys when they become young men. They develop muscle power and become stronger. Testosterone is also important for other changes, like a deeper voice and the growth of hair.

Both men and women produce testosterone, but men produce much more of it. But not all males produce the same amounts. Some naturally have higher levels than others. As men grow older, their testosterone levels drop.

FAITH LAPIDUS: Some people take testosterone supplements for medical purposes. But some athletes use testosterone to strengthen their muscles and improve performance. Testosterone supplements are banned in many sports. Researchers who have studied testosterone generally agree that long-term use may increase athletic performance. But they disagree about the short-term value. Also, testosterone supplements have risks. Most doctors agree that taking large amounts of testosterone can cause an increased risk of heart disease or other health problems.