Abstract: A composition which provides for rehydration and endurance in persons having symptoms of physiological stress comprises a blend of simple sugars and more complex carbohydrates and, at least magnesium, in the form of an amino acid chelate. Preferably the carbohydrate source is a blend of crystalline fructose and glucose polymers in a weight ratio of between about 4:1 and 1:4. Other ingredients, including anabolic nutrients, vitamins, electrolyte ions (e.g. potassium, sodium, chloride), and other minerals, such as calcium amino acid chelate, may be added as desired to provide an optimal rehydration and endurance formulation. When administered, the carbohydrate blend and amino acid chelates facilitate rehydration and the delivery of nutrients and calorie energy to appropriate sites within the body for efficient utilization.