Sleep · Supplements

Melatonin as a Supplement: When It Makes Sense — and When It Doesn't

3 Min. read YUTHI Redaktion

Melatonin is the world's most purchased sleep aid — but it is not a sleep aid in the classical sense. What melatonin actually does in the body, when it really helps, and why less is often more.

What melatonin does in the body — and what it doesn't

Melatonin is not a sleep aid in the pharmacological sense. It is a circadian timing signal: the pineal gland releases it in darkness to signal to the body that it is night. Sleep itself is prepared by this, but not directly induced. Those who take melatonin and expect to be asleep within 20 minutes will often be disappointed.

The most important effect is chronobiological: melatonin shifts the internal clock. This makes it particularly useful when the biological sleep time has fallen out of sync — for example with jet lag, shift work, or so-called delayed sleep phase syndrome, where people naturally don't feel tired until very late.

When melatonin has solid evidence behind it

The study evidence for jet lag is clear: melatonin, taken at the right time at the destination, helps the internal clock adapt more quickly. Lewy et al. (Chronobiol Int, 1992) showed early on that melatonin shifts circadian rhythms according to a well-described phase response curve — so the timing of intake is critical.

For primary sleep disorders (insomnia without an external cause), the effect is considerably weaker. A meta-analysis by Ferracioli-Oda et al. (PLoS One, 2013) found statistically measurable but small improvements in sleep onset latency and sleep duration — this does not represent a clinically relevant effect for most forms of insomnia. For older people whose endogenous melatonin production declines, the picture may look different.

Less is more: the dosage question

Melatonin products sold commercially typically contain 1 mg to 10 mg, and in some countries even more. Research suggests that low doses (0.5 to 1 mg) are similarly or more effective than high doses — because physiological melatonin levels are already in the low nanogram range, and higher doses far exceed this range without providing additional benefit.

Auld et al. (Sleep Med Rev, 2017) emphasised in their review of evidence for melatonin in sleep disorders that the timing and dosage of intake are more important than the absolute amount. For those aiming to fall asleep more easily: 0.5 to 1 mg around 30 minutes before the desired sleep time. For those wanting to shift their rhythm (jet lag): individually based on the phase response curve, often earlier in the evening.

For whom melatonin offers little benefit

Young, healthy adults with an intact circadian rhythm and regular sleep schedules benefit little from melatonin. When sleep problems stem from stress, racing thoughts, poor sleep hygiene or breathing issues (such as sleep apnoea), melatonin addresses the wrong cause.

Melatonin is also not intended for long-term use. There are no long-term studies on the risks of years of use in adults, and the hypothesis that exogenous melatonin could suppress the body's own production has not been fully ruled out. For short, targeted use — jet lag, time zone changes, occasional rhythm disruptions — the safety profile is good; for long-term therapy, the data are lacking.

How the YUTHI app can help you

If you try melatonin, it's worth documenting the time, dose and time of falling asleep in the YUTHI app. This way you can see whether and when taking it makes a measurable difference — and whether the effect diminishes after a few weeks. For persistent sleep problems, speaking with a sleep medicine specialist is the more sensible next step.

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