Taking a folic acid supplement helps prevent neural tube defects in your baby. The Government's Chief Medical Officer recommends that women who are planning to get pregnant, or women who are pregnant, take a folic acid supplement containing 400 micrograms of folic acid every day, ideally 3 months before your start trying to conceive, and throughout the 1st trimester of your pregnancy. If you eat a healthy diet, you already get some folic acid from fortified breakfast cereals, beans, leafy green vegetables and orange juice