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While there are several pieces of research that suggested a link between low levels of vitamin D in the blood and an increased risk of cardiovascular disease, researchers have now discovered that consuming vitamin D supplements won't decrease the risk. The study, published in the Journal of the American Medical Association Cardiology, found that vitamin D supplements did not decrease the incidence of heart attacks, strokes or other major adverse cardiovascular events. His finding was consistent for both men and women and for patients of different ages. Barbarawi led a team of researchers and reviewed data from 21 clinical trials, including more than 83,000 patients. Half the patients were administered vitamin D supplements, and half were given placebos. The meta-analysis of data showed no difference in the incidences of cardiovascular events or all causes of death between the two groups. Vitamin D sometimes is known as the sunshine vitamin, because human skin makes vitamin D when exposed to the sun. Thus, those living farthest from the equator tend to have lower levels of vitamin D in their blood. While some studies have found a link between low levels of the vitamin and an increased risk of adverse cardiovascular events, Barbarawi's study suggested that other factors, such as outdoor physical activity and nutritional status, might explain the association. As a result, he suggests that doctors and patients think twice about taking the vitamin to minimize the chances of a heart attack or other cardiovascular issues.