Folic acid is essential for the health of pregnant women and fetuses, especially in early pregnancy, a critical period for fetal organ system differentiation and placenta formation, when cells grow and divide rapidly. Folic acid can help the development of the neural tube. Folic acid can be taken through food or supplements, and the recommended daily intake is 400 micrograms, preferably through a variety of food sources, such as vegetables, legumes, citrus fruits and whole grains. However, the more folic acid you eat, the better. Excessive intake may mask symptoms of vitamin B12 deficiency or be related to health problems. Pregnant women should properly supplement folic acid under the guidance of a doctor.