I don't find that mainstream medicine has accepted Vit D supplementation as widely as it may seem (compared to the virtues extolled on a board like this). The Vit D Council is still on the fringe of mainstream medicine. Ask any current MD (I asked 3 of my personal friends) and they say sure everyone knows about the good news, but if you probe farther they don't really know any of the details. You just aren't going to find a majority of the doctors telling their patients they should be getting sunlight or popping D3, yet.