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CHICAGO (AP) - High doses of folic acid do not prevent precancerous colon polyps in people prone to them and may actually increase the risk of developing the growths, a new study finds.
It's the latest evidence that taking too many vitamins may be harmful. Last month, a study linked heavy vitamin use to fatal prostate cancer, and other research has shown beta-carotene pills can heighten smokers' risk of lung cancer.
The results surprised scientists. Previous studies showed diets low in folic acid led to a higher risk of colon cancer.
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