Melatonin and Heart Attacks: How High Is the Risk?

“Can melatonin harm your heart?” “Does melatonin increase heart attack risk?” These headlines are showing up more and more. You may have seen them too. This article puts the data into context and explains why one factor matters most: the difference between occasional and long-term use.

Melatonin is now widely available across Germany and many other countries. You can find it in drugstores, pharmacies, and online shops. It’s sold as sprays, capsules, and even fruit gummies, sometimes marketed specifically for children.

This widespread availability creates a strong sense of safety. If a product is so easy to access and even used for kids, it must be harmless, right?

That conclusion feels intuitive. And that’s exactly where the problem begins.

Melatonin is not a typical dietary supplement. It is a hormone that actively regulates key processes in the body. Beyond controlling the sleep-wake cycle, it also interacts with the cardiovascular system, hormonal balance, immune function, and blood clotting.

Melatonin use: occasional vs daily makes a critical difference

One key distinction is often overlooked: the difference between occasional and regular use.

Melatonin can be helpful in specific situations, such as jet lag or short-term sleep disruption. In these cases, it is used in a targeted and time-limited way.

However, current concerns and headlines primarily relate to regular, long-term use. And this is where the risk assessment changes significantly.

Melatonin is a hormone, not a standard supplement

Melatonin regulates the circadian rhythm but also affects multiple biological systems, including cardiovascular function, endocrine signaling, immune responses, and coagulation.

This means that regular intake is not a simple supplement routine, but a repeated intervention in complex physiological processes.

At ASPRIVA, we have already explored melatonin’s actual effects on sleep in detail. → Sleep problems? Why melatonin may not be the solution

On average, studies show only modest improvements in sleep onset and duration. This puts the perceived benefits into perspective, especially when considering long-term use.

Melatonin heart risk: what studies actually show

The scientific evidence is not conclusive, but it does reveal a pattern.

Short-term clinical trials generally report no serious side effects. However, these studies are not designed to detect long-term risks such as heart attack or heart failure.

Long-term insights mainly come from observational studies. Some of these analyses show statistical associations between regular melatonin use and cardiovascular events.

Importantly, this does not prove causation. But it is a signal that should not be ignored, particularly in the context of chronic use.

Melatonin side effects long term: what this means for you

For occasional use, there is no clear evidence of significant risk.

For daily use, the picture is different. Here, a hormonal mechanism, limited benefits, and uncertain long-term safety come together.

This is especially relevant given how easily accessible melatonin products are, often in formats that encourage routine use.

That combination is what makes the difference.

Is melatonin safe to take every night?

Melatonin can be useful in specific situations. But it is not a risk-free everyday solution.

The key question is not whether melatonin is simply “good” or “bad,” but how it is used. Occasional use may be appropriate. Long-term daily use should be viewed more critically, especially in light of ongoing discussions about potential cardiovascular risks.