- Reference Guide For Vitamins- Vitamin D
Guide with description of the vitamin including suggested dosage, necessity in diet, food sources, and substance interactions.
http://www.cybervitamins.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
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