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Maximize your endurance during intense training sessions or races by fueling up with the First Endurance EFS Drink, which provides over 1,000mg of all five electrolytes to prevents cramps and increase your endurance. This flavored sports drink contains three different high-glycemic carbohydrate sources for quick energy, and First Endurance fortified EFS with clinical doses of the amino acids glutamine, leucine, iso-leucine and valine to improve glycogen re-synthesis and delay fatigue.

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