Millions Take This Popular Supplement – Scientists Discover a Concerning Link to Heart Failure Melatonin supplements have become a go-to solution for millions of Americans seeking better sleep. Marketed as a natural and safe way to regulate sleep cycles, these over-the-counter pills are widely used by adults struggling with insomnia. Though, recent research has raised serious concerns about the long-term use of melatonin, particularly among individuals with chronic insomnia. An observational study conducted by the American Heart Association analyzed health records from over 130,000 adults with insomnia across multiple countries. The study compared individuals who used melatonin for at least one year with those who did not take the supplement. Participants who were prescribed other sleep medications or had pre-existing heart failure were excluded from the analysis to isolate the effects of melatonin. The findings revealed a significant association between long-term melatonin use and increased cardiovascular risk. Specifically, adults with chronic insomnia who took melatonin regularly for over a year faced a 90% higher chance of developing incident heart failure compared to non-users. A secondary analysis showed that those who filled at least two melatonin prescriptions spaced 90 days or more apart had an 82% increased risk of heart failure. Long-term users were nearly 3.5 times more likely to be hospitalized for heart failure and twice as likely to die from any cause over the five-year study period. These results were presented at the American Heart Association’s Scientific Sessions and have not yet undergone peer review. Researchers emphasize that the study identifies an association, not causation, and does not prove that melatonin directly causes heart failure. However, the strength of the correlation warrants caution, especially given the supplement’s widespread use. Melatonin is a hormone naturally produced by the body to regulate the sleep-wake cycle. Levels rise in response to darkness and fall with exposure to light. Although short-term use—typically defined as one to two months—is generally considered safe for most adults who are not pregnant or breastfeeding, data on the effects of prolonged use remain limited. As melatonin continues to grow in popularity as a sleep aid, experts call for further research to better understand its long-term safety profile. Healthcare providers advise patients with chronic insomnia to discuss sleep aid options with their doctor, particularly if considering melatonin use beyond a few weeks. Non-pharmacological approaches, such as cognitive behavioral therapy for insomnia (CBT-I) and consistent sleep hygiene practices, remain first-line recommendations for managing chronic sleep difficulties. Until more conclusive evidence is available, individuals using melatonin long-term should be aware of the potential risks and consult a healthcare professional to evaluate whether continued use is appropriate for their specific health needs. Monitoring cardiovascular health and exploring alternative sleep strategies may help mitigate potential concerns associated with extended supplementation.
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