Being an athlete at elevation requires extra effort–not just to breathe but also to stay hydrated and feel ready to hike, run, ski, bike, spin, or more. The latest formulation from Nuun, called Immunity, is a simple way to get vitamins, electrolytes, anti-inflammatories, and anti-oxidants all at once. It comes in two flavors, orange citrus and blueberry tangerine. While both are tasty, the orange citrus hearkens back to Tang, albeit in a less-sweet (each 15-calorie tablet has just 2 grams of sugar), refreshingly nostalgic way. Mix one tablet with 16 ounces of water to drink during your hike, wash down your daily fish oil, or sip anytime you want a welcome boost to your immune system (hint: take it when traveling or if you're starting to feel sick). The tablets are non–GMO Project verified, certified vegan and gluten free, and certified Informed Choice–Safe for Sport.

Look for Nuun at Ute Mountaineer, Roaring Fork Whole Foods Market, and Independence Run & Hike. $6.99 for 10 tablets, nuunlife.com