Some vitamins and minerals can have negative effects on the body if consumed in large amounts. The impact and the amount can vary with different nutrients. For a listing of specific nutrients, the foods in which they are found, why they are needed by the body, and the negative impact of consuming too much, see the alphabetical listing at the Iowa State University Dietary Supplements website, http://www.extension.iastate.edu/nutrition/supplements/supplement_list.php
Reference: Iowa State University Extension
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