Aromaleigh cosmetics - Prelude Daytime Treatment Primer Powder. (I bought from FemmeFatale)
A high coverage loose powder that gives an amazing overall healthy glow to my skin. It lasts me 12+ hours even with my oily skin, no primer and sunscreen underneath. (I wore this last Saturday at a trade show event, 6am-930pm with sunscreen and was still on when i got home - albeit a bit greasy looking haha).
I don't know much about the vitamins in it, but this is the best powder foundation i've ever used (and as an oily girl i have tried A LOT). You get quite a lot in the jar too, I bought this in december and use it a couple times a week and it still has loads of product. I don't really have a bad thing at all to say about this, except the lack of actual photos of the product - it was hard deciding which shade (I ended with Prelude II and i'm NC15 and it's a good match maybe a smidge dark but I don't mind), i'll totally be buying more when i run out.