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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.
In some cases supplements may be needed. These include: Vitamin D: If you are over 50, you have higher needs for vitamin D-an amount that may be difficult to meet with food alone. Health Canada recommends that men and women over the age of 50 take a daily supplement of 400 IU.