"If you eat meat there is never a reason to supplement with Vitamin D".
Most people are aware that food sources of Vitamin D are inadequate to obtain optimum levels.
In addition Vitamin D absorption from cholcalciferol is dependent on a number of factors including adequate cholesterol levels.
Is it really any wonder then that the vast majority of people are D Deficient because of the prevailing global-use of cholesterol-lowering drugs (statins); not the erroneous Marshall protocol where the vast majority of D experts have denounced it.
There has been a discussion/debate on whether D Receptors can be "plugged" or not. Plugged with what I wonder?. Bacteria doesn't cut it as an explanation because we need bacteria to live and survive.
Marshall also has no credentials in health-care or practice.