Yes: As noted in previous answer, you can od on fat soluble vitamins and studies of mega doses of water soluble vits actually speed up grow of cancers (they grow faster so need more nutrients) and your kidneys get better at excreting to that if you reduce you might actually get vitamin deficient.
Answered 5/8/2016
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Most of us: Do not not need extra vitamins. In reasonable amounts, they are not harmful.
Answered 11/28/2013
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