DO NOT take multivitamins that contain folic acid. and If you are pregnant, DO NOT take prenatal vitamins that contain folic acid!
Folic acid supplementation is dangerous – especially for 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. Researchers collected data on women’s folic acid intake from multivitamins over a 10-year period – they found that the women who took multivitamins containing folic acid were more likely to be diagnosed with breast cancer than those that did not. 1,2
A study published earlier this year found a 163% increased risk of prostate cancer in men taking folic acid supplements.3
A new meta-analysis of folic acid supplementation and colorectal cancer risk found that those who took folic acid for more than three years increased their risk of having a colorectal adenoma by 35%.4 In the U.S., Canada, and most recently Chile, colorectal cancer rates have climbed since the advent of mandatory fortification of flour with folic acid.10-11
Another new study, has found that folic acid supplementation by pregnant women increases the risk of childhood asthma by 26% 5, and yet another study linked folic acid supplementation during pregnancy to increased incidence of respiratory tract infections in infants, especially those resulting in hospitalization.6
This past month in Norway, where there is no fortification of flour with folic acid, researchers conducting a six-year study on the homocysteine-lowering effects of B vitamins in patients with heart disease made an unexpected finding: the patients whose supplement included folic acid had a greater risk of cancer incidence and cancer mortality.7 These patients were 43% more likely to die from cancer.
Most alarming was another study that compared women who took folic acid during their pregnancy to those that did not. Thirty years later those women who were given a hefty dose of folic acid during pregnancy were twice as likely to die from breast cancer.8 Shocking info huh! One more thing: 180,000 people die each year with diseases that are related to folic acid. Even more miscarriages are related to folic acid.
Eat foods rich in folic acid for natural digestion of this mineral, and your body knows how much you need.