Source
Arch Intern Med . Demographic differences and trends of vitamin D insufficiency in the US population. Accessed December 23, 2011
National Academy of Sciences. Institute of Medicine. Food and Nutrition Board. Dietary Reference Intakes: Recommended Intakes for Individuals. Accessed December 23, 2011
U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans. Nutrients of concern. Accessed December 23, 2011
U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans. Appendices 12-15. Accessed December 23, 2011
Written by familydoctor.org editorial staff
Created: 01/12