Vitamin D, Linus Pauling Institute
- Discussion of function, deficiency, disease prevention, disease treatment, food sources, supplements, research, and recommendations from the Linus Pauling Institute.
- http://lpi.oregonstate.edu/infocenter/vitamins/vitaminD/

Science News Online: Enough Isn't Enough: An Epidemic of Vitamin D Deficiency
- Report on a study that found many U.S. women of childbearing age, particularly those of African descent, lack sufficient vitamin D even though they consume the recommended amount.
- http://www.sciencenews.org/articles/20020622/fob3.asp

Vitamin D- Facts and Information
- Facts on the vitamin such as RDA intake, functions, absorption, and deficiency signs including rickets.
- http://www.go-symmetry.com/vitamin-d.htm

Vitamin D- Calciferol
- Description of the sunshine vitamin with recommended dosage, deficiency signs, and list of food sources.
- http://www.anyvitamins.com/vitamin-d-info.htm

Vitamin D- Overview
- Explains functions of the vitamin with RDA intake suggestions, symptoms of deficiency, and foods high in calciferol.
- http://www.nlm.nih.gov/medlineplus/ency/article/002405.htm