HealthAndFitness

Long-Term Melatonin Use Linked to Nearly Double Heart Failure Risk, Study Finds

billytheked

Co-relation does not equal causation. This is an observational study, it does not show that melatonin causes heart failure.

FTA:
> “This doesn’t prove that melatonin directly causes heart failure,” said Nnadi, noting that the study was observational. People who take melatonin every night may simply have more severe insomnia, which itself could raise heart risks.

Note also that the melatonin users in the study were _prescribed_ melatonin, which probably means it was a much higher dose than what over-the-counter users take, often 1-3mg. But those details weren't mentioned in this article.

And this:
> The research could only track prescribed melatonin, since some over-the-counter use isn’t recorded in medical records. That means some people counted as “nonusers” may have taken melatonin without telling their doctors.
