Difference between Vitamin D and D3?

Vitamin D, or calciferol, is a fat-soluble vitamin found in or added to foods or available as dietary supplements

Vitamin D includes D2 and D3, so comparing it to D3 is invalid. 

There are significant differences between vitamin D2 and D3. 

According to NIH, plants create vitamin D2 and animals—including humans—produce vitamin D3. 

Although both are easily absorbed, vitamin D3 raises and maintains blood levels better than vitamin D2.

Abnormal serum levels may indicate liver or renal problems.

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