![]() The main role of vitamin D in the body is to manage blood levels of calcium and phosphorus. Though both vitamin D2 and vitamin D3 can increase blood levels of vitamin D, some research suggests that vitamin D3 is more effective ( 7). Later, the storage form is converted by the kidneys to the active form of vitamin D that’s used by the body ( 1). This is the form that is measured in blood tests. The ultraviolet (UV) rays from sunlight convert cholesterol in your skin into vitamin D3 ( 1).īefore your body can use dietary vitamin D, it must be “activated” through a series of steps ( 1).įirst, the liver converts dietary vitamin D into the storage form of vitamin D. However, sunlight is the best natural source of vitamin D3.
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