Vitamin D is a highly discussed topic these days. In our office we feel that Vitamin D can have great benefits for certain patients. Due to all of the questions surrounding Vitamin D, it has been highly researched lately. Fortunately, virtually all of the research has supported the use of Vitamin D for various issues and for various benefits. Decreased vitamin D causes B-cell activity to increase in Multiple Sclerosis patients. B-cell activity is not a good thing. http://www.