Redcliff- do you live in the uk? Very few foods have vitamin d in them (some countries fortify their milk with vit d but I'm pretty sure the uk doesn't) so most of vit d comes from sun exposure- again in short supply here!
Vitamin d is needed to absorb calcium, calcium alone isn't enough apparently. So I'm carrying on taking the pregnacare tablets as they have the iron/vit d etc but agree that frolic acid isn't really needed anymore.
Saying this I think all the vitamin/supplement guidance is aimed at people on poor diets, and is over cautious too so I don't think there's too much to be concerned about. Vit c is a good example where the diet should give more than enough.
In other news I just got the long awaited nuchal blood test results back and screened 1:100000, so feeling very thankful for that.