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Iowa State University Extension. Supplements. Accessed May 12, 2010
Mayo Foundation for Medical Education and Research. Dietary Supplements: Nutrition in a pill?. Accessed May 12, 2010
MedLine Plus. Dietary Supplements. Accessed May 12, 2010
United States Food and Drug Administration. Dietary Supplements. Accessed May 12, 2010
National Institutes of Health Office of Dietary Supplements. Dietary Supplements: Background information. Accessed May 12, 2010
United States Department of Agriculture. Dietary Guidelines for Americans 2005: Adequate nutrients within calorie needs. Accessed May 12, 2010
United States Food and Drug Administration. Tips for the Savvy Supplement User: Making informed decisions and evaluating information. Accessed May 12, 2010
United States Food and Drug Administration. Fortify Your Knowledge About Vitamins. Accessed May 12, 2010
Written by familydoctor.org editorial staff
Created: 05/10