Definition: Anabolic steroids are derivatives of the male sex hormone, testosterone. They're used in the medical world to help rebuild tissues that have become weak because of serious injury or illness. Some athletes use steroids illegally to improve performance and muscle mass, but the use of steroids in sports is illegal and there can be some serious side effects.
Anabolic Steroids
By Paige Waehner, About.com
Updated June 19, 2009
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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