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U.S. Department of Health and Human Services

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If I take vitamins already, should I be eating foods that are fortified with vitamins as well? Is there such a thing as taking too many vitamins?

In some circumstances, additional vitamins and minerals may be helpful. However, taking too much of certain vitamins and other nutrients can be harmful under certain circumstances. The National Academy of Sciences has established for many nutrients "tolerable upper intake levels," which provide guidance on how much is safe. It is important to check with your health care professional for advice about your specific situation.

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