With the EFS endurance bar, you get the same award-winning 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, Iso-leucine and Valine to improve glycogen resynthesis and delay central fatigue. It also provides 200% RDA of Vitamin C to enhance the body's immune function, fight free radicals and keep you healthy for future training and racing. The EFS bar is made with all natural ingredients, organic ingredients and is gluten-free.