However, it’s also vital that women get enough before pregnancy, since it’s necessary for the very earliest stage of fetal development. The baby needs this nutrient to make the cells for his or her brain and bones, as well as organs and skin. The Recommended Dietary Allowance (RDA) for folic acid for all women, except those who are pregnant, is 400 micrograms. Best dietary sources are leafy green vegetables (especially spinach), citrus fruits, nuts, legumes, and whole grains. Since getting the daily requirement of folic acid through your diet can be difficult, many women depend on a supplement or multivitamin for help.