And I do believe that Marshall nailed the issue with this quote:
“For half a century, medical Science has been noting the association between vitamin D serum levels and disease. What developed has been a concept of ‘vitamin D deficiency’ based solely on the notion that ‘low’ vitamin D serum levels somehow cause disease processes. But this ignores the alternative hypothesis — that the disease processes themselves regulate the vitamin D metabolism —that the observed ‘low’ values of vitamin D in disease are a result of the disease process, not the cause.”
in my experience, he is dead on here. and no, this is not referring to the marshall protocol, nor did I do the marshall protocol, or advocate the marshall protocol. but, he is right about vit d.