Endura-max Electrolyte Powder Supplement For HorseDesigned specifically for endurance horses For preloading prior to the start of a competition endura max can be mixed with the grain portion of the diet Provides the extra calcium and magnesium often lost during long slow exercise Replenished the electrolytes and trace minerals lost during sweating Supports normal hydration by stimulating the thirst response Made in the usa Size: [5 Pound]