This link explains the difference:
http://www.vitamindcouncil.org/
Quote:
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As far as vitamin D supplements are concerned, we believe cholecalciferol is the preferred oral form of vitamin D, as it is the compound your skin makes naturally when you go in the sun. It is more potent and perhaps even safer than the synthetic analog, ergocalciferol, in more common use. Vieth R, Chan PC, MacFarlane GD. Efficacy and safety of vitamin D3 intake exceeding the lowest observed adverse effect level. Am J Clin Nutr. 2001 Feb;73(2):288–94. Cholecalciferol is 1.7 times more efficient at raising 25(OH)D levels than is ergocalciferol.
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ergo is D2
chole is D3
from
http://www.vitamindcouncil.org/treatment.shtml
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Weezie looking at petunias 8.25.2017
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