Vitamin D2 is found in plant-based sources like mushrooms and fortified foods, while Vitamin D3 is found in animal-based sources like fish, liver, eggs, and is also synthesized by the skin when exposed to sunlight.
Source
Vitamin D2 is called ergocalciferol, and Vitamin D3 is called cholecalciferol.
Chemical Structure
Vitamin D2 is not absorbed as well by the body, whereas Vitamin D3 is absorbed more effectively and used better by the body.
Absorption
Vitamin D2 is converted into its active form in the liver and kidneys, but not as effectively as Vitamin D3, which is converted more easily.
Conversion
Vitamin D2 is less stable and breaks down more quickly over time, while Vitamin D3 is more stable and lasts longer.
Stability
Vitamin D2 is often found in prescription supplements, while Vitamin D3 is commonly available in over-the-counter supplements.
Supplements
Vitamin D2 is often found in prescription supplements, while Vitamin D3 is commonly available in over the counter supplements.
Usage
This content including advice gives generic information only and is in no way a substitute for qualified medical opinion.