[quote=jpinpb]Marshall’s research has demonstrated how ingested vitamin D can actually block VDR activation, the opposite effect to that of Sunshine…..

Vitamin D deficiency, long interpreted as a cause of disease, is more likely the result of the disease process, and increasing intake of vitamin D often makes the disease worse.
[/quote]

“Dr.” Marshall is not a medical doctor, he’s an engineer, but I would still put him in the category of quack. Virtually no one in the medical community takes his claims seriously and his forum is heavily censored.

The Marshall Protocol advocates (among other things) complete abstinence from sunlight and any other source of D. Some people have become extremely ill from it.