Vitamin D3 is the active form of D. Historically D2 was in vitamins and the RX version is still D2, but that is changing. D2 is less active and the storage form. All the new testing and research is focusing on active D3 now. Labels today are reflecting the new awareness of the public for having supplements in the D3 form.
D2 is also called ergocalciferol.
D3 is cholecalciferol.
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Weezie looking at petunias 8.25.2017
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