My wife is currently taking 50k of d3 once weekly. I was told by dr that was d2. DC
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 synthesized by plants and Vitamin D3 is the internal form that we make mainly through exposure to the sun.
Both Vitamin D2 and D3 can be taken as a Vitamin D supplement.
For some, cholecalciferol (D3) is the preferred type.This is because certain people in the health field believe vitamin D2 supplements are not as potent as their D3 counterparts. However, there is also research evidence to suggest that vitamin D2 is just as effective as vitamin D3. For now, the debate continues, and people must trust their own instincts when making a choice.
Ergocalciferol D2 and cholecalciferol D3 are available OTC and on a prescription.
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