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WebMD Health News: " Vitamin D Deficiency Worsens Breast Cancer?"
WebMD Feature: " Are You Getting Enough Vitamin D?"
WebMD Health News: " Vitamin D Deficiency May Hurt Heart."
WebMD Health News: " Calcium/Vitamin D Slows Weight Gain."
WebMD Health News: " Vitamin D Fights Colon Cancer."
WebMD Health News: " Vitamin D Compounds May Fight Prostate Cancer."
National Institutes of Health Office of Dietary Supplements, Dietary Supplement Fact Sheet: Vitamin D, updated Nov. 13, 2009.
The Vitamin D Council web site.