Posted in Web Can Melatonin Cause Heart Failure? What to Know About Claims … November 5, 2025 The risk of heart failure was 4.6 percent for those in the melatonin group, compared to 2.7 percent for those who had no record of taking melatonin. https://www.nytimes.com/2025/11/05/well/melatonin-heart-health-study.html