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In one of the first human studies on the anti-inflammatory antioxidant quercetin, doctors sought to discover whether quercetin could enhance maximum aerobic capacity and delay fatigue.

A dozen healthy but untrained men and women, average age 23, took 500 mg of quercetin twice per day or a placebo for seven days then traded places for another seven days. Compared to placebo, those taking quercetin could absorb four percent more oxygen and ride a stationary exercise bicycle 13 percent longer before fatigue.

Study authors believe that quercetin raises endurance and relieves fatigue by increasing mitochondria, the energy powerhouse of the cell, and that this study shows rapid improvement in endurance capacity in a short time.

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