Low vitamin D levels are associated with a higher risk of death, according to a report released on August 11, 2008 in the Archives of Internal Medicine, one of the JAMA/Archives journals. Vitamin D is a group of prohormones that play important roles in calcium metabolism, bone formation, parathyroid function, and the immune system. Presently, the ideal bood levels of 25-hydroxyvitamin D (25[OH]D) has been suggested as 30 nanograms per milliliter or higher.
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