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First Endurance continues to stay at the forefront of endurance nutrition with E3, a new energy drink that combines the latest clinical research with the input and feedback from elite endurance athletes. E3 contains an ideal blend of simple and complex carbohydrates, amino acids, antioxidants and electrolytes to provide endurance athletes the nutrients they need to fuel working muscles and increase endurance during exercise. Specify Flavor: Tangerine or Lemon-Lime