![]() ![]() Vitamin D is turned into calcidiol, the storage form of the vitamin, which is then converted into calcitriol, the active steroid form. For example, it promotes the absorption of calcium and phosphorus from your gut ( 14).īut scientists have recently discovered that it also plays roles in other areas of health, such as immune function and protection against cancer ( 15). Vitamin D affects various cells related to bone health. This is similar to how most other steroid hormones work ( 12, 13). When the active form of vitamin D binds to this receptor, it turns genes on or off, leading to changes in your cells. This is the active, steroid-hormone form of vitamin D.Ĭalcitriol interacts with the vitamin D receptor (VDR), which is found in almost every single cell in your body ( 10, 11). Second, it is converted to calcitriol, or 1,25(OH)2D, mostly in your kidneys. Vitamin D needs to undergo two conversion steps to become active ( 8, 9).įirst, it is converted to calcidiol, or 25(OH)D, in your liver. ![]()
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