cholesterol

There is a cholesterol that is found in the skin that will help to absorb the vitamin D that you get from the sun. This substance is called 7 dehydrocholesterol.

Sun exposure and cholesterol. Sun exposure converts 7-dehydrocholesterol to previtamin D3, which is then converted to Vitamin D.

1,25- Dihydroxy vitamin D

7 - dehydrocholesterol is found in the stratum spinosum and stratum basale of human skin to produce vitamin D. The correct quantity is 25 to 50 milligrams per square centimeter.