I like the vitamins without artificial ingredients - there are quite a few brands to choose from. Even a regular grocery store should have a few, but you'll have a better selection if you check out a health food or natural food store. :) Lots of people like Rainbow Light, Nature's Way seems pretty good, etc etc.

For weight loss, you might want to look into calcium supplements as well, they can really help. Just make sure to get calcium citrate (not from oyster shells, those can have heavy metals), instead of calcium carbonate like Tums has. I hear chalk is not well absorbed by the body (and it makes me mad, because I took Tums for calcium all through my first pregnancy without knowing that). :P