GU Roctane Electrolyte Capsules provide added electrolyte support on top of GU hydration-drink products. The electrolytes (sodium, magnesium, chloride) aid in hydration by maintaining water balance and plasma volume. Vitamin D is important for calcium absorption and bone health. Vitamin B6 and ginger root may help to combat nausea. Take GU Roctane Electrolyte Capsules before, during, or after exercise to replenish electrolyte levels from any energy-demanding activity resulting in sweat loss. Take 1-2 capsules per hour of activity. Increase dosage in extreme conditions. Wash down with your favorite GU Hydration Drink or water.