http://drmintz.blogspot.com/2009/01/which-vitamin-should-i-take.html
3. Vitamin D. We are learning more and more about Vitamin D. I have blogged before about a study published in the Annals of Internal Medicine showing that women with low vitamin D levels have a much greater risk of fracture than women with normal or high vitamin D levels, and it just today it was reported that a low level of vitamin D in older patients is associated with a higher risk of cognitive impairment.