The researchers looked at 60 multivitamin products on sale between November 2004 and March 2005.
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"Though vitamin E is important to health, we aren't suggesting people take more than a multivitamin, " said Benson.
If she gets hungry, she snacks on fruit slices or downs water and takes a daily multivitamin with extra iron.
He uses small acoustic tags (the size of a large multivitamin capsule) that are sewn into the body cavities of salmon.
He also took a multivitamin pill and drank a protein shake daily.
So a good multivitamin or a vitamin C or B-complex could help.
"People are reaping protective benefits from vitamin E simply by taking a multivitamin, " said neurologist and study author Dr. Richard Benson of CPMC.
This is the gold standard for medical research, because it means that whether or not they got the multivitamin was the only difference between the drug and placebo groups.
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Having a vitamin deficiency (such as of calcium or magnesium) may be linked with teeth grinding, so it's important to follow a well-balanced, nutritious diet and take a multivitamin supplement if needed.
Ofri, an assistant professor of medicine at New York University Medical School, says when patients complain about being tired, for example, she'll sometimes suggest they take a multivitamin, even though there's no proof they work against fatigue.
While crushing pills may ensure that they break down appropriately in the stomach, taking them with milk is not great idea, as milk may interfere with the absorption of some of the nutrients in a multivitamin such as iron.
The new study, published in the Journal of the American Medical Association and presented at a medical conference held by the AACR, has several big advantages over previous trials, and is the best-conducted study of multivitamin use conducted to date.
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