For as liberating and exciting as modern travel may be, it definitely takes a toll on your body. Going the distance brings jet lag, new foods, unusual environments, and sometimes stress. Regardless of whether you're staying close to home or getting off the grid, maintaining your well-being should always be at the top of the to-do list. Building up your immune system predeparture and maintaining personal health while on the road doesn't have to be difficult. Habitual jet-setters and world wanderers should keep reading for the 15 best vitamins and supplements that every traveler should have on hand.