The Endurance Bar You've Been Waiting For First Endurance continues to stay at the forefront of endurance nutrition with the development of the EFS endurance bar. With the new EFS endurance bar, you get the same awardwinning EFS drink formula in a great tasting bar that provides ALL the ingredients you need to maximize performance. Like the EFS drink mix, EFS bars are fortified with clinically effective doses of the amino acids Glutamine, Leucine, Isoleucine and Valine to improve glycogen resyn
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