ABC News reports that some vitamins can "do more harm than good". Studies are showing a lack of evidence in benefits of high doses of any vitamins. How bad can high doses be you ask?
Vitamin E, which many people believe protects against heart disease and cancer, has been found to increase risk of heart failure and cancer when people take anything more than 400 IUs a day.
Vitamin A can cause birth defects in high doses so it's potentially hazardous for women who may become pregnant. A 2002 Harvard study of more than 72,000 nurses showed that high doses of vitamin A led to a higher risk of hip fractures.
Vitamin C is popular, especially during cold season, but there's no evidence that it prevents colds. It may shorten the duration by a very small amount, but not enough to notice. New studies have found vitamin C, if taken at the same time a patient is getting certain medical treatments, such as chemo for cancer, can interfere with that treatment.
Vitamin E, which many people believe protects against heart disease and cancer, has been found to increase risk of heart failure and cancer when people take anything more than 400 IUs a day.
Vitamin A can cause birth defects in high doses so it's potentially hazardous for women who may become pregnant. A 2002 Harvard study of more than 72,000 nurses showed that high doses of vitamin A led to a higher risk of hip fractures.
Vitamin C is popular, especially during cold season, but there's no evidence that it prevents colds. It may shorten the duration by a very small amount, but not enough to notice. New studies have found vitamin C, if taken at the same time a patient is getting certain medical treatments, such as chemo for cancer, can interfere with that treatment.
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