Sustain Sport is the only performance drink with four electrolytes and just 30 calories to help you rehydrate, rebound, and recover. Why Is That Important Electrolytes are crucial minerals that are lost when you sweat, and water alone cannot put them back. Electrolytes perform three key functions: 1) Help maintain proper muscle function, 2) Help ensure proper communication between the muscles and brain, and 3) Support energy and water absorption into the body. Only Sustain Sport packs 4 electrolytes (twice as many as Gatorade Thirst Quencher Original Orange) into each serving to give your body what it needs most. Sustain Sport contains: Only 30 calories per serving, Vitamin C, Vitamin E, and Vitamin B12. According to Medicine & Science in Sports & Exercise, chugging an energy drink will allow you to compete at your best for 37% longer than drinking water alone. Choosing Sustain Sport allows you to gain an extra edge without gaining unwanted calories.