Many are bloated with unnecessary calories. The label of one leading brand, for example, reports that it supplies half the daily requirement for some nutrients. But to get that amount, you have to drink the whole bottle, which contains 125 calories. And for that you get just 6 of the 40-plus essential nutrients provided by most supplements.
Smarter Move: Drink plain, refreshing, calorie-free water when you're thirsty—and take a multivitamin daily to make sure you get balanced levels of the essential vitamins and minerals.