A review of 5 years of health records for more than 130,000 adults with insomnia who had used melatonin for at least a year found they were more likely to be diagnosed with heart failure, require ...

People with chronic insomnia who used melatonin long term had a roughly 90% higher risk of developing heart failure over five years, according to a large preliminary study. The findings do not prove ...

Add Yahoo as a preferred source to see more of our stories on Google. A supplement some turn to for help getting some shut-eye may not be as harmless as once thought, a preliminary study suggests. The ...