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

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1. title: Long-term melatonin use linked to 90% higher heart failure risk (alleges; supported) Source
2. url: https://www.sciencedaily.com/releases/2026/08/260829035228.htm (alleges; supported) Source
3. summary: 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 taking the popular sleep supplement for extended periods. (alleges; supported) Source
4. published: Sat, 29 Aug 2026 06:52:20 EDT (alleges; supported) Source