It is a well - known fact that a woman needs extra folic acid before conception and during pregnancy, which is why it is an important ingredient in prenatal vitamins. (mommyedition.com)
Women who are carrying twins and multiple babies need to take extra folic acid and iron because of the increased blood volume and chance of anemia. (aboutkidshealth.ca)
You'll also need extra folic acid to protect against neural tube birth defects, as well as more iron to help red blood cells carry oxygen to your baby. (webmd.com)