Folic acid supplements could increase the risk of cancer, particularly lung cancer, researchers have found. However, folic acid has proven benefits for pregnant women, as it cuts the risk of babies being born with major deformities of the brain and spine. The doses of folic acid linked to cancer are higher, and were taken for longer, than the doses recommended for pregnant women.
What do we know already?
Our bodies use folic acid, also known as vitamin B9, to help build new cells. The natural form of the vitamin, called folate, is found in spinach, broccoli, beans, and peas. Most people get enough folate from food, but it's recommended that women who are pregnant or thinking of having a baby take folic acid supplements. Extra folic acid cuts the risk of birth defects like spina bifida.
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