Are prescription based prenatal vitamins better formulated than otc vitamins? do they cause less nausea? any advantages compared to otc?

NO, NO & NO: Prescription-based prenatals on average cost more than otc. They are not better formulated, are often more difficult to absorb & offer no advantages. Prescription or not, avoid vitamins with unnecessary additives like artificial colors & titanium dioxide. Capsules may be better than tablets. Ideally they should have folate (folic acid) as l-5-mthf. http://pregnancy.about.com/cs/prenatalvitamins/a/aa043000a.htm.