People who used the supplement daily for more than 12 months had worse health outcomes than those who didn't use the supplement.

Adults suffering from insomnia who had been using melatonin for a year or more had 90% higher odds of heart failure, researchers found in a new study.

People who used the supplement daily for more than 12 months had worse health outcomes than those who didn't use the supplement.

Long-term melatonin was use associated with heart failure, according to a new study. But there's more to the story.