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| Anabolic steroids are among the most popular peformance-enhancing drugs used by athletes. Taken by injection or in pill form, these substances stimulate the growth of new muscle tissue and reduce muscle fatigue. Steroids can also result in serious health problems, and they are banned in many sports. | ||||||
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| Mark Allen Johnson/ZUMA/Corbis | ||||||
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| Appears in these articles: | ||||||
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| Performance-Enhancing Drugs; Steroids | ||||||
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