Nuun is a simple and easy to use hydration solution that addresses a serious issue. Nuun's formulation is based upon research and feedback from some of the world's top academic and practicing experts in the field of sports medicine (specifically in dehydration and hyponatremia). The focus is on the three main aspects of hydration; speed of absorption, electrolyte content, and carbohydrate content. Nuun produces a hypotonic solution so that your body will absorb Nuun faster than the leading sports drinks or even water alone. Your body is, therefore, able to restore optimal water and electrolyte balance more quickly. It provides up to three times the sodium that traditional sports drinks provide. This amount, in addition to the other critical electrolytes contained in every Nuun tablet, ensures that you are adequately replenishing your body's stores to help you perform at your best, and stay healthy. To ensure rapid absorption, Nuun contains no carbohydrates and is sugar free. Enjoy Nuun as it turns every water fountain into a source of optimal, balanced hydration. Other Ingredients: Active Ingredients Level (mg) Sodium (carbonates) 360.0 Potassium (bicarbonate) 100.0 Calcium (carbonate) 12.5 Magnesium (sulfate) 25.0 Vitamin C 37.5 Vitamin B2 500mcg Vitamin B2 500mcgUsed by cyclists, triathletes, runners, hikers, yoga-bods, travelers, adventure racers, kids, rowers, motorcyclists, people at work, and anyone else trying to stay properly hydrated. One lightweight, waterproof tube holds 10 tablets. Drop one effervescent tablet in 16 oz. water. Each tube makes 1.5 gallons (6 litres). Weight: less than 2 oz.