Comment: Antarafacial Hydride Sigmatropic shift results: cholecalciferol.

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Antarafacial Hydride Sigmatropic shift results: cholecalciferol.


When adequate amounts of UVB light reach the skin, the 7-dehydrocholesterol undergoes a 6-electron conrotatory electrocyclic reaction that converts into an intermediary substance called Previtamin D3. Pre-D3 is an oil that must be absorbed into the skin for the conversion to continue.

Previtamin D3

After several hours, previtamin D3 goes through a spontaneous transformation. This transformation is scientifically called an antarafacial hydride sigmatropic shift. The result is an early form of vitamin D3 called cholecalciferol. This is the form that is in vitamin D3 supplements. It is extracted from animal products and put into capsule form. Cholecalciferol can also be obtained from natural food sources. Food containing cholecalciferol includes several species of fish, fish liver, chicken eggs, and beef liver.

Cholecalciferol is only the first form of vitamin D3. In this form, it is still not usable for anything by the body. It is either absorbed into the bloodstream from the skin or, if in supplement form, the gastrointestinal tract. Once in the bloodstream, cholecalciferol is absorbed by the liver, where it undergoes its next transformation.
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