Ron and Rick,
I have also read quite a bit about the Marshall Protocol. It seems that the question about vitamin D is "too little, or too much?". What I read concerning the MP involved an initial treatment in which Vitamin D, including that generated in skin by sunlight, is stringently restricted. Other, subsequent stages of the treatment involve the use of certain antibiotics.

What is strange is that the "experts" in vitamin D function are now suggesting that the current recommended daily allowance, or RDA, for D is much too low. The other day I heard someone on a medical program say that a minimum of 1000 units/day should provided for a normal adult, but twice that amount was now recommended. Previously, the recommended daily value was less than 500 units.

The one attractive feature of the MP is that it appears to focus on chronic inflammation resulting from inappropriate stimulation of the innate immune system by the notorious "Th1 pathogens".