Can folic acid reduce the risk of birth defects?

If you have already had a pregnancy affected by a birth defect of the brain or spinal cord, ask your health care provider how much folic acid you need. Studies have shown that taking a larger dose of folic acid daily can reduce the risk of having another affected pregnancy. The larger dose needs to be taken at least 1 month before pregnancy and in the first trimester of pregnancy.

The recommended dose in this case is 4 milligrams (4,000 micrograms).

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