You have already had lots of replies, so I hope this helps too. Folic Acid is a B vitamin and the average person should take at least 400mg, and this is not so easy to get from food, so all women of childbearing age should take extra. Also, B vitamins should not be taken in isolation, look for a multivitamin-mineral that contains ample doses of all 8 B vitamins. You can then take additional folic acid with the multivitamin. Take a DHA (Omega 3) separately, this is essential for brain development. Choose a high quality DHA supplement that has had all heavy metal toxins removed from the oil, and is extracted using from cold water fish. You can safely have 1200mg of DHA a day. I would recommend a book called Secrets of Supplements, The Good, the Bad and the Totally Terrific by Gloria Askew.