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Long-term use of melatonin supplements to support sleep may have negative health effects
DALLAS, Nov. 3, 2025 — Long-term use of melatonin supplements, often used to promote sleep and address insomnia, was associated with a higher risk of heart failure diagnosis, heart failure hospitalization and death from any cause in chronic insomnia, according to a preliminary study to be presented at the American Heart Association’s Scientific Sessions 2025. The meeting, Nov. 7-10, in New Orleans, is a premier global exchange of the latest scientific advancements, research and evidence-based clinical practice updates in cardiovascular science.
Melatonin is a hormone naturally produced in the body by the pineal gland, and it helps regulate the body’s sleep-wake cycle. Melatonin levels increase during darkness and decrease during daylight. Chemically identical synthetic versions of the hormone are often used to treat insomnia (difficulty falling and/or staying asleep) and jet lag. The supplements are widely available over the counter in many countries, including the U.S. In the U.S., over-the-counter supplements are not regulated, so each brand of supplement can vary in strength, purity, etc.
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