Caffeine has proven ergogenic effects, although these vary depending on the condition of the athlete and the intensity, duration and type of exercise ( 'Journal of the International Society of Sports Nutrition). Caffeine is effective for improving athletic performance in trained athletes spartagen xt who consume low-moderate (3-6 mg caffeine / kg) dose. There is no added improvement from 9 mg / kg and is not advisable to exceed the dose of 500 mg / day. The positive effects can be felt when

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