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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
For type 2 diabetes, vitamin D has been taken by mouth in the form of calcitriol, 1-alpha calcidiol, cholecalciferol, doxecalciferol, and ergocalciferol, at doses ranging from 400-200,000 IU, 0.25-2 micrograms, and 1.5 milligrams for seven days to seven years.