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In an ideal world, no one would need dietary supplements. Our balanced diets would provide all the vitamins, minerals and other nutrients our bodies need. Alas, the world of American eating is far from ideal. And that, some nutrition experts and supplement advocates argue, is why we need dietary supplements. The latest federal data show that more than half of U.S. adults use dietary supplements, mostly multivitamins.
Vitamin supplements should only be taken under advice of a doctor. If you are pregnant or over the age of 50, you are more likely to need supplements. Also, supplementation is only a last resort if you cannot obtain B vitamins through diet, or if you have certain health conditions that warrant their use.