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The MP seems to work by retricting the level of vitamin D in the body.

levels of 25-D over 20 ng/ml can bind and inactivate the VDR, which subsequently shuts down the innate immune system"
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If I understand this right, the MP restricts Vit D. The result would be continued activity of the innate immune system.

Since the big problem in PD seems to be an overactive innate system, it would seem counter-intuitive (i.e. "dumb" ) to promote "continued activity".

The opposite would be true if one were after a hidden pathogen, which is what I remember the MP being about. And it may be just dandy for that. But for auto-immunity something doesn't fit.