Known as the sunshine vitamin, one of the key roles of vitamin D is maintaining serum calcium and phosphorous balance. Our bodies make vitamin D by converting vitamin D2 (ergocaliferol) into D3 (cholecalciferol). Vitamin D3 is
the bioidentical form of vitamin D synthesized in the skin following exposure to sunlight. Vitamin D3 is also the form the body derives from dietary cholesterol. When calcium and phosphorus levels dip in the body, parathyroid hormone (PTH) is released to increase vitamin D conversion to the active form. D3 is then metabolized to calcitriol, a steroid hormone that helps regulate a variety of genes through the vitamin D receptor (VDR). While vitamin D is available in both the D2 and D3 forms as supplements, studies have found vitamin D3 is the preferable form.

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