New research into a popular sleeping aid has some scientists worried about long-term usage.

An analysis of adults with insomnia, which has not yet been peer-reviewed, has found that people prescribed melatonin for more than a year are at greater risk of heart issues.

Among more than 130,000 adults across multiple countries, those who were prescribed melatonin long-term had an 89 percent higher risk of heart failure over five years, and were twice as likely to die from any cause, compared with those not prescribed melatonin.

The findings are preliminary and don't change current health recommendations. They do not necessarily mean that melatonin – the fourth most popular natural product taken by adults in the US – is causing dangerous repercussions.

What the results do suggest is that

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