What Is Cholecalciferol? Cholecalciferol, also known as Vitamin D3, is a type of Vitamin D which is produced by the skin when exposed to sunlight. Because the body produces it, Vitamin D3 is not a true vitamin, but it is usually considered a vitamin due to its importance in the human body. Cholecalciferol Benefits Cholecalciferol may help fortify the bones, promote heart health, and support immune function. Cholecalciferol may also aid cognitive function, promote healthy mood, and support brain function.
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