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WikiPedia: Vitamin D http://dietary-supplements.info.nih.gov/factsheets... http://ods.od.nih.gov/factsheets/vitamind.asp http://www.beyonddiscovery.org/content/view.txt.as... http://www.dairycouncilofca.org/PDFs/vitaminD.pdf http://dmoz.org/Health/Nutrition/Nutrients/Vitamin... http://www.skincancer.org/sunscreen/the-d-dilemma.... http://www.vitamindcouncil.org/ http://www.webcitation.org/5Rl5u0LB5