In regions where sun exposure may be limited, supplemental vitamin D may be required to maintain normal blood levels. The exact amount of vitamin D to achieve normal levels is unknown and usage varies in different regions and communities, which can cause problems, say the researchers. Dr. Bunch stresses that patients need to tell their doctors about all of the vitamins and supplements they take, as well as all medications, in order to ensure they get the best care possible. He says this research also suggests that checking blood levels of vitamin D in patients that develop atrial fibrillation may help uncover the cause of the abnormal heart rhythm disorder.
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