Electrolytes need to be maintained in an even balance for your body to function properly. SUSTAIN provides everything you need and nothing you dont in order to sustain safe electrolyte levels in the body. Sports drinks have too much sugar and not enough electrolytes to really help your body replenish the electrolytes it needs. As a very low calorie, low carb fat, and protein-free product it will not interfere with other nutrition needs and choices for their activity. Whats in SUSTAIN? It contains optimal supplements of three electrolytes we deplete during exercise. These key electrolytes are Magnesium (20mg), Sodium (500mg), and Potassium (500mg). They support your muscular activity by re-establishing balance to your bodys water and electrolyte levels during and after physical activity. During exercise, mix 1-2 packets in 16-32 Oz of water for each hour to replace electrolytes lost through sweat and effort to maintain optimal performance and health.