Was wondering if there is a prenatal vitamin that is "the best"? I order mine from a private website. The brand is "promise"... But my doctor told me they give them free at shnucks and a vitamin is a vitamin. I kind of disagree with my doctor given the research I've done... And I pay a significant amount for mine. Worth it or no? Do you guys take a higher grade prenatal or just regulars from shnucks or walmart?