The blood serum vitamin D levels of 3,258 older people who had attended a coronary artery disease clinic were monitored across nearly eight years. At the end of the period, the researchers compared the average vitamin D3 levels of the 737 patients who had died during the trial with the average levels of those who had not, and found that those with the lowest levels had been more than twice as likely to die as those with the highest levels - both from cardiovascular disease and from ‘all causes’.

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