Kitty is correct.
The doctors typically give D2 on RX...called ergocalciferol.
This is known now to be useless for raising levels in humans.
It comes in only one dose= 50,000 IU
D3...called cholecalciferol, is over the counter and the active form of Vit D.
You can read more about this here:
http://ajcn.nutrition.org/content/84/4/694.full
It is a shame that doctors still don't know this distinction.
The general rule is that for dosing based on blood work =
1000IU of D3 daily for every 10 points you need to raise.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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