Long-term use of melatonin supplements may be linked to an increased risk of heart failure hospitalization, the American Heart Association reported Monday.

Melatonin is commonly used to treat insomnia and promote sleep, often marketed as a safe, natural option. However, data on its long-term cardiovascular safety are limited, which prompted researchers to investigate its impact on heart health, specifically in adults with chronic insomnia.

The study analyzed five years of health records from more than 130,000 adults with insomnia. About 65,000........

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