I have found differences in the units, but what I really mean is the differences in the chemistry & the indications. I know vit D helps preserve the Calcium in bones, but what other indications are for the diff types of vit D?
11 Dec 2009
German researcher Adolf Windaus first discovered 3 forms of vitamin D, which he called D1, D2, and D3. It was later learned that the vitamin D1 was a mixture of compounds rather than a pure vitamin D product, so the term D1 is no longer used.
The term "Vitamin D" now refers to several different forms.
The two forms important in humans are : ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3). Vitamin D2 is a synthetic form (man made) and Vitamin D3 is the internal form that we make.
See: http://www.nlm.nih.gov/medlineplus/druginfo/natural/patient-vitamind.html - see notes under dosing for uses of different forms of vitamin D.
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