When I've asked my doctor about about vitamin supplements, she said I didn't need them, even if I'd gone for five days without being able to keep any food down. If your doctor recommends you get more of a vitamin, I assume they think you may have a deficiency or something and that their advice is good, but studies seem to indicate that if you're already of good health, you won't improve your health further by taking vitamin supplements. It is more likely to do harm than help you.
About pre-natal vitamin requirements, I have no idea!
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