The Role of Folic Acid in Pregnancy
Four hundred micrograms (400mcg) of folic acid is found in the typical over-the-counter multivitamin sold in the supermarket or pharmacy. Strictly speaking, "prenatal vitamins" are not necessary, because the non-prescription "regular" vitamin has "enough" folic acid.
Prenatal vitamins make some women feel bad: constipation and stomach aches are common. Alternatives to the prenatal vitamin include a "regular" over the counter vitamin OR a children's chewable vitamin.