A study that reviewed health records for tens of thousands of adults with chronic insomnia found that people who took prescribed melatonin for more than a year had a higher chance of heart failure over five years compared with people who were identified as nonusers, the American Heart Association announced Monday. The researchers behind the study also reported that people taking melatonin were more likely to be hospitalized for heart failure and die of any cause than those who did not use the supplement.
