Links to related organizations

•PubMed comprises more than 27 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

•Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines

•GrassrootsHealth is a nonprofit public health research organization dedicated to moving public health messages regarding vitamin D from research into practice.

•A free Collaborative website dedicated to Vitamin D

•Vitamin D Council is here to educate patients, families, doctors and health professionals on vitamin D and safe, sensible sun exposure to improve the quality and longevity of lives.

•The Vitamin D Society is a Canadian non-profit group organized to: Increase awareness of the many health conditions strongly linked to vitamin D deficiency, encourage all Canadians to be proactive in protecting their health and have their vitamin D blood levels tested annually, and fund valuable vitamin D research.

For more information on UVB exposure, vitamin D, and nutrition to reduce the risk of chronic and infectious diseases, these websites are very useful. The first two also provide kits for 25-hydroxyvitamin D concentration ("vitamin D level") determination based on dried blood spots.
The recommended range for 25-hydroxyvitamin D concentration is 30-70 ng/ml (75-175 nmol/l)
Vitamin D:

General access to journal papers. Search by author, key words, titles, etc. Full papers may be available from pubmed or or from the authors