Yes, there are two tests.
The Marshall Protocol is still questionable and only followed closely by people with sarcoidosis. At this time Sarcoid is the only disease, that is watched by medical doctors doing Vit D supplements. The Marshall Protocol remains unproven.
Your testing should be for the 25-OH D which is the active form, D3.
I prefer this website for information:
http://www.grassrootshealth.net/
It is slightly more conservative than some of the others out there, and I retain a bit of that conservative attitude because of my own training.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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