Preformance enhancing drugs such as steroids.

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…believed to have no direct impact on the performance of an athlete but instead, it simply allows athletes to train more efficiently and enhances their performance through weightlifting. It has shown to be somewhat effective in clinical studies in speeding up recovery from workouts, adding lean muscle mass, and it is quickly becoming as popular as multivitamin supplements, at least among athletes, though whether creatine is safe in the long term remains to be seen.