GU Energy Roctane Ultra Electrolyte Capsules provide electrolytes: sodium, magnesium, and chloride to aid in hydration by maintaining water balance and plasma volume* Take before, during, or after exercise to replenish electrolyte losses from any energy-demanding activity resulting in heavy sweat loss Includes Vitamin D, which is important for calcium absorption and bone health* Includes vitamin D to help offset deficiencies and improve performance With Ginger Root to soothe occasional gastrointestinal distress*