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Vitamin D: Quick Facts. Office of Dietary Supplements and National Institutes (ODS) of Health (NIH), June 2011. http://ods.od.nih.gov/factsheets/VitaminD-QuickFacts/
It is not the intention of Liberty Mutual Insurance to provide specific medical advice, but rather to provide information for people to better understand their health. You should consult with your doctor about specific medical questions and before starting an exercise program, especially if you have not exercised in a while.