There is no RX D3, only D2-- it exists because historically there was only one D treatment decades ago. Now the generic corresponds to that one.
D2 is not active in the body. D3 is the active form.
Here is the most recent D thread:
http://neurotalk.psychcentral.com/thread92116.html
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Weezie looking at petunias 8.25.2017
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