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Are you addicted to multi-vitamins? Mira Vohra , a 25-year-old hotel executive began her day popping four vitamin pills. She popped another two in the evening and one before she went to bed. Vohra believed that this boosted her stamina, and looks.

Vitamins and Supplements: Do They Work?

Vitamins and dietary supplements are big--more than 110 million Americans forked over a collective $28 billion in 2010 on little bottles of would-be health magic. Research is unclear, however, on whether shoring up your diet with extra vitamins, minerals, and other supplements helps or hurts--in the short run or in reaching for the century mark.

Vitamins: Are They Really Good For You?

People are grabbing up bottles that claim to promote health and longevity. But new research shows not all vitamins are good -- and some can even be harmful.