How much vitamin D?

I recently read the article about vitamin D research from the main gallery page and was thinking that I would look at supplementing vitamin D....and maybe even A and E - at least over the winter. Being that I already get some (1200i.u.) from my multi-vites and calcuim supplement, how much more should I be taking? Would I be better off taking a A, D & E supplement instead...and again...how much? Thanks!

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