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I'm curious as to what research you're referencing. I started taking a vitamin D supplement a few weeks ago at the encouragement of my father, and it seems to be making a difference in my sense of well-being, but I'd welcome a few pointers if you have any handy. (Don't mean to impose, though.)

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The big study on vitamin D that got everyone's attention was this one from the summer of 2007:

Vitamin D and Calcium Supplementation Reduces Cancer Risk: Results of a Randomized Trial (http://www.ajcn.org/cgi/content/abstract/85/6/1586)

There is also a lot of information about vitamin D research at the Vitamin D Council website (http://www.vitamindcouncil.org/).

That being said, I don't know if taking a vitamin D supplement would have any noticeable effect on your sense of well-being. I think it's probably a good idea to take one even if you don't notice a difference.

> I don't know if taking a vitamin D supplement would have any noticeable effect on your sense of well-being

Yeah, that was totally unexpected and is purely anecdotal.

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