Here is a short list of the best websites on vitamin D that are currently available on the internet. I can’t vouch for all the material on each website, but most of what I have seen has been reliable.
Vitamin D Wiki is the site maintained by Henry Lahore, a retired electronics engineer. He is a big fan of vitamin D and has tried to gather everything you want to know about it at one web site.
Grassroots Health is a consortium of scientists, institutions and individuals committed to solving the worldwide vitamin D deficiency epidemic. Among other things they offer a spot test to get your own vitamin D tested. Some of the top scientists in the field of vitamin D research are on their national scientists’ panel.
Vitamin D3-Cholecalciferol is the brain child of Alex St. Clair, a South African who is into “just about anything health-related.” In this web site he attempts to educate the public about the benefits of vitamin D.