What Our Gearhead® Experts Are Saying:"I toss a tube of GU Hydration Tabs into my pack on every trail run and long hike because plain water just does not cut it once the miles start stacking up. The 320mg of sodium per tab makes a real difference in how I feel in the back half of a long effort, and the flavors are light enough that I never get tired of them. The mixed box is a great way to figure out which one becomes your go-to."Two hours into a hot summer trail run, plain water stops feeling like enough. That is exactly the moment the GU Hydration Tabs Mixed Box was built for. Drop one tab into your bottle, watch it fizz out, and what you get back is a light, electrolyte-charged drink that actually replaces what sweat takes away. GU formulated each tab with 320mg of sodium and 55mg of potassium, the two key electrolytes your body burns through fastest under load, at just 10 calories per serving. The mixed box gives you four flavors to rotate through, so hydration never becomes a chore. Lemon Lime, Orange, Tri-Berry, and Strawberry Lemonade each bring enough flavor to make the bottle worth reaching for without ever feeling heavy or syrupy. Vegan, gluten-free, and naturally sweetened with stevia and cane sugar, these tabs fit clean into any nutrition plan. Keep a tube in your running vest, your jersey pocket, your pack, or your gym bag, and you will never be caught without a real hydration option again.