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SaltStick, the company behind the electrolyte dispenser that can mount on your bike or fit inside your handlebars, recently released SaltStick Caps Plus, an electrolyte supplement with 30 mg of caffeine. The vegetarian supplement has key electrolytes, plus vitamin D, which aids in calcium absorption. If you find that popping pills is tricky while riding or running, the capsule contents can be fully dissolved in liquid—even in water—and have an extremely mild taste. $29.95, Saltstick.com