Vitamins are in food: A person in the U.S. Who eats a balanced diet, has normal digestion, and exercises outdoors regularly, does not become vitamin-deficient even if she never buys any vitamin-supplements from the store. Some disorders can make a person deficient in certain vitamins over time, so doctors do check for certain conditions as needed. Not getting iodine from salt or foods, may lead to thyroid problems.
Answered 1/25/2014
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