Folic acid is the focus...

One of the main reasons prenatal vitamins are recommended, especially in advance of becoming pregnant for those who are trying to conceive is folic acid. While many food sources contain folic acid, the March of Dimes has reported that the synthetic form of folic acid is more easily absorbed than the natural form. It's something you should keep in mind when searching for the best prenatal vitamin. Look carefully at the recommended dosage of folic acid and what that particular vitamin product contains.