Skratch Labs' Exercise Hydration Mix uses all natural ingredients to replenish the fluids and electrolytes you lose during intense physical exertion. Dr. Allen Lim developed this unique formula for pro riders plagued by headaches and upset stomachs caused by the artificial ingredients found in most sports drinks. Lim found that the key to maintaining hydration wasn't simply in electrolyte replacement, but rather relied on regulating the body's sodium levels, which is why the Exercise Hydration Mix contains a level of sodium that is similar to many emergency grade rehydration formulas. And because Lim's formula uses all natural ingredients and is only flavored with real fruit, it's easy on your stomach while providing just enough calories to refuel your working muscles. It also tastes great, probably because it wasn't formulated with a list of chemicals we can't pronounce.