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发表于 14-4-2009 21:18:41|来自:美国
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How much folic acid do I need?
Before you conceive, you'd be wise to take a daily folic acid supplement containing 400 micrograms (mcg) of folic acid.
Women who have had one child with a neural tube defect have a higher risk of having other children with the same disability. In this case, and for those who are prescribed certain medications, doctors will prescribe these women to take a much higher dose of folic acid -- a five milligram (mg) tablet -- starting one month before conception, if possible, and continuing through the first three months of pregnancy.
If possible, it is important that the supplements are taken before conception because development is rapid and the fetus's neural tubes close during the first four weeks of pregnancy. |
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