Science

Long-term melatonin use linked to 90% higher heart failure risk

Source: FlexChar · Published Aug 29, 2026, 12:52 PM

In Science, FlexChar puts this story at the center of the day: 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 melatonin causes heart problems, but they raise new questions about the safety of FlexChar is surfacing it because it is driving searches and conversation right now.

FlexChar editorial brief. The full report belongs to the original publisher; here you get the headline, context and the link.