Vitamin D is a hormone (not a vitamin) that targets more than 2,000 genes in the body (that is 10 percent of the total number of genes in the human body). Moreover, deficiencies have been linked in at least 17 different cancer types, cardiovascular disease, ankylosing spondylitis, birth defects, and more.
Because my level was so low it got me thinking that perhaps others with autoimmune related conditions might have deficient levels as well. For this reason, I suggest a vitamin D baseline level for those who can justify the test (for example because of an abnormal liver panel or some underlying disease process); it should be paid by insurance. The test is expensive, so do not assume your insurance will pay for it.
The research on vitamin D continues -
Click on the title (link), to read more on this important hormone.