Any woman who has been pregnant will know the importance of taking folic acid pills.
For decades, a daily 400 microgram (mcg) dose has been recommended even if a woman is simply trying to conceive — and if she then becomes pregnant, to continue taking it for the first 12 weeks.
The reason is that folic acid, a man-made version of the B-vitamin folate, protects babies in the womb against spinal and brain deformities.