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Dangers of Folic Acid
The Dangers of Folic Acid in Multivitamins and Prenatal Vitamins Folic acid supplementation is dangerous for everyone, but especially pregnant women. Women who take supplemental folic acid increase their breast cancer risk by 20-30%, according to a study in the American Journal of Clinical Nutrition.
Folic-Acid Fortification of Flour and Increased Rates of Colon Cancer Data from Chile show that there has been an increase in the rate of colorectal cancer since 2000, when the government introduced a mandatory program of fortification of wheat flour. A similar increase was reported in the United States and Canada in the late 1990s.