What is the best electrolyte drink for endurance athletes?

The best electrolyte drink for endurance athletes delivers meaningful sodium (at least 500 mg per liter), a modest amount of carbohydrate to aid absorption, and little else that could upset your stomach at race pace. Commercial options like LMNT, Precision Hydration, and Skratch Labs all perform well, but a homemade mix of water, salt, citrus juice, and a small amount of sugar costs a fraction of the price and lets you dial in your exact sodium dose. Avoid drinks with excessive artificial sweeteners, proprietary blends, or caffeine unless you are intentionally timing the caffeine around your effort.