Stay properly hydrated and your legs will repay you. GU's great-tasting Electrolyte Brew is loaded with sodium, potassium, and carbohydrates to keep you going hard and your system in balance. By replenishing the nutrients lost through sweat, you'll be able to perform longer and stave off fatigue.
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This product has worked great for me in the Florida summer weather, it replenishes what is lost in sweat but on long rides i can't stand the sweet flavor, so much that i just can't drink it anymore and have to drink water only. Fortunately i found Endurolytes FIZZ effervescent tablets, i really love lemon-lime flavor. I can drink it all day long in century rides.