While TTC at least 400 micrograms (mcg), or 0.4 milligrams (mg).
Taking folic acid for at least one month before conception reduces the risk of neural-tube defects, such as spina bifida, by up to 70 percent, according to the Centers for Disease Control and Prevention.
During pregnancy, the recommended dose jumps to 600 to 800 mcg, or 0.6 to 0.8 mg. Of course, some women's needs are different. If you have a family history of neural-tube defects, you should probably get 4,000- 5,000 mcg (4mg-5 mg) of folic acid a day.
Folic acid is a water-soluble vitamin, so your body will flush out the excess if you consume too much.