This is a universal supplement of vitamin B group. Taking folic acid reduces the chances of neural tube defects such as spina bifida. You should start taking at least 400mcg /day of folic acid at least three month before pregnancy. In certain high risk women, the recommendation is to take 5mg / day. Folic acid comes in a tablet by itself, or in combination with pregnancy multivitamins, or with other supplements such as iodine or iron. You can get folic acid from the pharmacy over the counter without a script.