WHAT IS ELECTROLYTE POWDER? Electrolyte Powder contains Sodium, Potassium, Calcium & Magnesium. Many electrolyte products contain only two electrolytes. When added to carbohydrate, Electrolyte Powder contributes to the maintenance of endurance performance during prolonged endurance exercise. Electrolyte Powder means that you can control the amount of electrolytes you consume relative to your carbohydrate drink. Alternatively, it can be used to top up carbohydrate drinks that contain low