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Nuun Sport Electrolyte Tablets ($21, originally $30)

Any runner or biker knows the importance of electrolytes during a long-haul workout — especially in the summer heat. These tablets instantly dissolve in water and customers find them particularly effective. With less than one gram of sugar, they're also non-GMO, gluten free, and vegan — and they contain magnesium too, which helps prevent muscle cramps. The Citrus Berry Twist is currently on sale, so you can get a taste for all the flavors.