Vitamin D2 has been known for a long time to not be as good as vitamin D3
Recent studies have found that vitamin D2 actually DECREASES vitamin D3 in the blood
The first form of vitamin D to be discovered is the only one that most doctors can make a prescription for, Vitamin D2
The D3 form has been known for many decades, but the medical profession has not yet adapted - only 20,000 paper on D3 so far.
Several recent studies have shown that vitamin D2 may actually reduce the levels of D3 in the blood
AND, worse still, D2 actually increases a health problem, instead of reducing it, the way vitamin D3 does
Vitamin D3 not D2 page
has many references, graphs, and pictures of D2 in case you are sold D2 instead of D3
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!VitaminDWiki has a lot more information, such as