Folic acid is a B vitamin that plays a critical role during pregnancy. It helps in the formation of the neural tube, which develops into the baby's brain and spinal cord. Adequate folic acid intake significantly reduces the risk of neural tube defects. The recommended dosage for pregnant women is typically 600 to 800 micrograms per day. Women trying to conceive are advised to start taking folic acid at least one month before pregnancy. Folic acid is found in fortified cereals, leafy greens, and legumes but may be insufficient from diet alone. Therefore, supplementation is usually necessary to meet the recommended levels.