Enhance your on-the-go hydration by adding the effervescent, caffeinated nuun Sport + Caffeine tablets. Formulated with nuun's signature electrolyte blend, 100% of vitamins B3, B5, B6, B12, 30% of B2, and 40mg of caffeine, you're sure to keep going strong during even the toughest workouts. nuun Sport + Caffeine is a great low calorie, vegan and gluten-free way to get all the electrolytes you need to help alleviate cramps, improve muscle function and burn energy efficiently. Each box contains 8 tubes; each tube contains 10 tablets.