Folic acid supplementation can help prevent neural tube defects (NTDs) like spina bifida. The CDC recommends that women planning to become pregnant take 400 micrograms of folic acid daily starting at least one month before conception through the first trimester. Women at high risk for NTDs due to family history should take 4,000 micrograms daily. Getting adequate folic acid from foods and fortified grains can also help reduce NTD risk.