Dr. Barry Sears Dr. Sears Comments:

Although most Americans appear to be deficient in Vitamin D, intervention studies have been found to lacking.  It appears that Vitamin D levels are related to general good health and very low levels are not directly related to any chronic disease state unless it is rickets.  However, there is some indication that Vitamin D has a role to play in gut health and this may be linking factor between high levels of Vitamin D and better health.