How much folic acid(mg)should be taken while planning for pregnancy?

0.4 mg/400 microgram: The U.S. Public Health Service and Centers for Disease Control and Prevention recommend that all women of childbearing age consume 0.4 mg (400 micrograms) of folic acid daily to prevent two serious birth defects: spina bifida (the backbone does not form and close as it should) and anencephaly (the baby is born without parts of the brain and skull). A simple step to prevent serious problems!