Melatonin helps regulate the sleep-wake rhythm and is also studied in cardiovascular research. This does not establish general protection from a nightly supplement. Sleep treatment and heart treatment each need their own rationale.
Which questions different research can answer
| Study | Limit of the finding |
|---|---|
| Laboratory test on oxidative stress | Does not prove prevention of a heart attack |
| Small study of blood pressure measurements | Does not replace assessment of clinical benefits and risks |
| Observation in medical records | Can show associations, but not establish cause and effect on its own |
Interpret safety signals correctly too
In 2025, the AHA reported medical-record findings linking longer-term melatonin use with more heart failure. This preliminary conference finding does not prove causation; incompletely recorded use and coexisting illnesses limit its interpretation.
Neither a possible laboratory benefit nor an observed risk association is enough for a self-directed treatment decision. The long-term safety of freely used melatonin preparations remains insufficiently established. Discuss treatment with the responsible doctor rather than changing the dose because of a headline.
Review the medicine list together
Reviewing the whole combination is particularly important with blood pressure medicines, anticoagulants and other calming substances. Dizziness or next-day tiredness can affect everyday safety. Do not drive or operate machinery when drowsy.
Do not stop heart medicines yourself or replace them with melatonin. Seek immediate medical help for new chest pain, difficulty breathing or fainting. Persistent sleep problems need assessment independently of any supposed heart protection.
Frequently asked questions
Is melatonin proven to prevent heart attacks?
No. Existing research does not support a general recommendation for heart attack prevention.
Does an observational study prove that melatonin causes heart failure?
No. Potential confounding factors and further studies must be considered.
