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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.
Take this test. There is some data to suggest that vitamin D may decrease insulin resistance. For example, in one study of 124 people with type 2 diabetes, researchers found 113 (91.1%) had vitamin D deficiency. hemoglobin A1C is used to determine blood glucose control over the past three months or so.