Prenatal folic acid supplements have proven effective in preventing neural tube defects such as spina bifida. A Norwegian study tracking 85000 children recently discovered a 40% reduction of incidences of autism in children born to women who took the B vitamin before and during their pregnancies, compared to women who did not take the supplement. If you plan to become pregnant, be sure to start the supplements before hand; about 6 to 8 weeks. The study also showed that women who started the supplement mid-term did not have similar results; the children had no lower risk of autism. The Center for Disease Control recommends 400 micrograms of folic acid daily for women who are or plan to become pregnant.
~ JAMA, 2013