(organic) vitamin D helped me this winter because there is less sun during these months (in Canada). I also sit a lot less in front of my computer since i've r

(organic) vitamin D helped me this winter because there is less sun during these months (in Canada). I also sit a lot less in front of my computer since i've read http://www.businessweek.com/print/magazine/content/10_19/b4177071221162.htm http://www.businessweek.com/print/magazine/content/10_19/b41... (thanks HN for this) .