Vitamin D3, calciferol, is a fat-soluble vitamin. It is known as the “sunshine” vitamin because it is formed in the body by the action of the sun’s ultraviolet rays on the skin. Vitamin D3 is converted in the kidneys to the hormone calcitrol, which is actually the most active form of vitamin D3. The effects of this hormone are targeted at the intestines and bones.
Vitamin D3 requirements increase with age, while the ability of skin to convert sunlight into Vitamin D3 decreases. In addition the ability of the kidneys to convert calcidiol to its active form also decreases with age, prompting the need for increased Vitamin D3 supplementation in elderly individuals. One billion people in the world are currently Vitamin D3 deficient.
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