Your Isotonic Drink! During prolonged exertion, the body tends to reach high levels of dehydration that can result in a loss of strength, and have negative consequences on the cardiovascular system and on the regulation of body temperature. Gold Drink GoldNutrition® isotonic contains a combination of carbohydrates with a high glycemic index – dextrose and maltodextrin – and fructose with the aim of optimizing the maintenance of glycemic levels, preventing hypoglycemia that occurs as the exercise goes on. It also has the necessary dose of sodium to increase the absorption and retention of water in the body and prevent situations of hyponatremia (low plasma sodium) that occur during prolonged physical exercise and, especially, at high temperatures.