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SUPPLEMENT SIDE EFFECTS

Here's a warning for well-muscled types. Users of the popular food supplement creatine -- one of the few shown to actually help build muscle -- are tearing muscles, gaining weight and cramping. Doctors and trainers can't prove the conditions resulted from creatine, but "fear of the unknown should make us think twice," says Mark S. Juhn, a sports medicine physician at the University of Washington.

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