Proper high-quality sleep is important because it allows your body to rest and repair, and having irregular sleep patterns increases your risk of a whopping 172 diseases.

In an effort to curb sleep deprivation, experts started recommending the public to take melatonin supplements. In fact, consumers have become so reliant on them that the industry for melatonin supplements was valued at $2.84 billion in 2024.2

Now, a preliminary study throws a wrench at the longstanding belief that taking melatonin supplements helps improve sleep quality. According to the findings, which were presented at the American Heart Association's (AHA) Scientific Sessions 2025, long-term use of melatonin supplements was linked to an increased risk in heart failure.3 But is there any truth to this?

Does Melatonin Truly Increase Heart Risk?

According to these preliminary findings, adults with chronic insomnia who used melatonin for at least a year had worse long-term heart outcomes than those who never had melatonin listed anywhere in their medical records. However, there are problems with this research that need to be taken into account.