Vitamin D3 is created in the skin when a type of cholesterol called 7-dehydrocholesterol is exposed to ultraviolet B (UVB) radiation from the sun.
When UVB radiation penetrates the skin, it causes a chemical reaction that converts the 7-dehydrocholesterol into pre-vitamin D3.
This pre-vitamin D3 is then quickly converted into vitamin D3, which is the active form of vitamin D that our body can use.
Vitamin D3 is then transported to the liver and gets converted into Calcidiol. Calcidiol is then transported to the kidneys and gets further converted into the active form of vitamin D, called Calcitriol.
Calcitriol is the form of vitamin D that is responsible for many of the important functions of vitamin D in the body, such as regulating calcium and phosphorus absorption in the gut, promoting bone health, supporting immune function, and more.
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