Low Vitamin D has been studied for years. Multiple vitamin D studies on neurologic and vascular disease are very impactful. A recent study out of University of Massachusetts showed how the lowest Vitamin D patients had the largest stroke, or cerebral vascular accidents. Vitamin D Level less than 30 ng/ml showed two times larger areas of dead tissue in the brain, post CVA/stroke. Nicely, the change of healthy recovery post stroke was significantly correlated to higher vitamin D levels. Every 10ng/ml vitamin D level above 30 ng/ml the rates of health recovery after 3 months doubled. Bottom line- OPTIMIZE your D!