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Old 11-10-2009, 09:43 AM   #3
Zach Frankhouser
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Join Date: Oct 2009
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I'd definitely appreciate more detail. The Vitamin D supplement (wfs) that I take is the Cholecalciferol form of Vitamin D3, the inactive form.

It appears that the liver hydroxylizes this form of D3 into Calcidiol, which is then converted to calcitriol in the kidneys. Link (wfs)

Why doesn't calcitriol show up on a blood test? Why is the measurement of the Calcifediol form of D3 thought to be the best measurement of Vitamin D in the blood?

Is it possible to take measured doses of the active form of Vitamin D3, calcitriol, to get the benefits of Vitamin D supplementation, or is it best just to take the inactive form and let the body regulate activity as needed?
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