Vitamin D2 or D3?

Many people do not know the difference between vitamin D2 and D3. If you have low vitamin D levels and your MD has given you a prescription for it, you are most likely getting D2. Normally, the body makes vitamin D when UVB rays change cholesterol in your skin into vitamin D, the D3 form. This is the normal form of vitamin D for all animal systems. To get D2, fungus (mushrooms) are irradiated with UV light to get D2. Since D2 is a plant source of D, and D3 is an animal source of D, which one do you think you should take? Studies have shown that D2 will raise your blood levels of D, but D3 does it better and since it is the preferred form, D3 is what should be used. Therefore, I recommend patients take D3.