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" I&amp;#039;ve heard that too much vitamin A is dangerous. How much is too much? And are there other vitamins or minerals that I could overdose on? \u2014Rosario Fernandez, New York, NY Rosario, you&amp;#039;re smart to be concerned about overdoing it; I know so many people who gobble down scary amounts of tablets.  You&amp;#039;re safe with a multi that covers about 100% of the Daily Value (DV) for all vitamins and minerals. Daily Values are the levels of vitamins and minerals set by the Food and Drug Administration for the general population. Some vitamins, like most of the Bs and Cs, are safe in doses many times the DV. But watch out for the following nutrients \u2014 you don&amp;#039;t want to overdo them.  Vitamin A: The &amp;quot;preformed&amp;quot; versions, called vitamin A palmitate or acetate, are dangerous in doses higher than 200% of the DV, or 10,000 IU (International Units) daily. Too much can raise the risk of hip fractures and cause damage to the nervous system and the liver. But unless you&amp;#039;re a smoker, exceeding 10,000 IU is not considered dangerous if the source of vitamin A is beta-carotene and alpha-carotene \u2014 plant pigments that the body converts to vitamin A as needed. (The label will usually say if the source of vitamin A is beta- and alpha-carotene.) There is no maximum set for these plant precursors of the vitamin, so it&amp;#039;s still a good idea to cap it at 10,000 IU, no matter the source.  Vitamin E: Although there doesn&amp;#039;t seem to be any harm in getting high doses of vitamin E from foods, too much supplemental E can cause excessive bleeding and a host of other symptoms such as fatigue. The research is still unclear; it appears that up to 100 IU daily is safe and may be beneficial. Iron: Too much iron can cause constipation and may (research is still unclear) raise the risk of heart disease and cancer. Premenopausal women need 18 mg daily; men and postmenopausal women need just 8 mg. Zinc: Too much of this mineral interferes with the body&amp;#039;s ability to absorb copper, and weakens the immune system. Try not to go over the Daily Value of 15 mg. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.goodhousekeeping.com/health/diet-nutrition/a19752/overdose-vitamins-minerals-jan07/>