Melatonin: the right time to take it in the evening
Futures Nutrition Editorial Team · 11 August 2026
Melatonin: the right time to take it in the evening
11 August 2026
The authorised statement names the moment in three words: close to bedtime. A number of minutes is not given there. With a tablet that releases the substance immediately, "close" in practice means roughly half an hour before the planned bedtime — that puts the peak blood level about where you want to be yourself, namely in bed. The frequently quoted rule "one to two hours beforehand" comes from an entirely different product: from the leaflet of a prescription prolonged-release tablet. Transferring it to an immediate-release tablet moves the timing an hour in the wrong direction.
Melatonin contributes to the reduction of time taken to fall asleep. The beneficial effect is obtained with the consumption of 1 mg of melatonin close to bedtime.
What the authorised statement says about timing
Regulation (EU) No 432/2012 lists two statements for melatonin, and both contain a time reference — a relative one, though, not an absolute one.
| Authorised statement | Timing according to the condition |
|---|---|
| Melatonin contributes to the reduction of time taken to fall asleep | close to bedtime, 1 mg |
| Melatonin contributes to the alleviation of subjective feelings of jet lag | on the first day of travel close to bedtime and on the first few days after arrival at the destination, at least 0.5 mg |
Two things follow from this. First: what matters is the distance to going to bed, not the time on the clock. Someone who goes to bed at 10 p.m. has a different moment than someone who goes to bed at one in the morning — both meet the same condition. Second: "close to" is deliberately not expressed in minutes in the text of the regulation. How close is sensible does not follow from the law but from how fast the substance gets from the particular tablet into the circulation.
Which amount belongs to which statement, and what higher strengths change about that, is set out in Melatonin dosage: 0.5, 1, 2, 5 or 10 mg?.
Why "one to two hours" does not apply to every tablet
Melatonin from an ordinary, immediate-release tablet is absorbed quickly. Systematic reviews of the pharmacokinetics give, for such preparations, a time to peak concentration of about 15 to 90 minutes, on average around 50 minutes, and a half-life of roughly 45 minutes. The spread between individuals is large: bioavailability after swallowing lies, depending on the investigation, between about 9 and 33 per cent.
A prolonged-release tablet is built differently. It gives off the substance over hours, so that the level does not fall again shortly after going to bed. That is why the product information for Circadin 2 mg — a prescription medicine for adults aged 55 and over — instructs that the tablet be taken 1 to 2 hours before bedtime and after the last meal. That lead time belongs to the delayed release. With a tablet that disintegrates within minutes, it is simply an hour too early.
| Dosage form | Release | Sensible timing | Reason |
|---|---|---|---|
| Tablet or capsule, immediate release | within a few minutes | about 20 to 30 minutes before bedtime | peak level after roughly 15 to 90 minutes |
| Drops or spray | fast, partly via the oral mucosa | close to bedtime | no or only brief passage through the stomach |
| Prolonged-release tablet (medicine) | over several hours | 1 to 2 hours beforehand, after the meal | that is what the product information says |
In practice this means: take the tablet, brush your teeth, lights out. Anyone who swallows it and then sits in front of a screen for another hour and a half has not hit the moment named in the condition — they have only placed it earlier.
The distance to food
A meal changes absorption measurably. In the product information for Circadin both states are set side by side:
| fasting | after a meal | |
|---|---|---|
| Time to peak concentration | 0.75 hours | 3.0 hours |
| Peak plasma concentration | 1176 pg/ml | 1020 pg/ml |
So the peak level comes later and turns out somewhat lower. That was measured with the prolonged-release tablet; the direction — food delays — applies to absorption in the gastrointestinal tract generally.
No general rule "always on an empty stomach" follows from this, and here it is worth looking closely. With the prolonged-release tablet the delay is no problem, because the product releases over hours anyway — the instruction "after the meal" has reasons there other than speed. With an immediate-release tablet, by contrast, that very speed is the point: anyone who swallows it directly after a substantial evening meal may push the peak level back by hours.
As a rule of thumb for the fast tablet: one to two hours' distance from the last larger meal. A small snack or a glass of water is no obstacle. Anyone who eats late anyway moves the meal rather than the tablet — otherwise the late plate collides with the planned bedtime.
At a similar time each evening
Because the condition refers to the distance from going to bed, the moment is tied to your own bedtime — and for most people that shifts by one to two hours between weekdays and the weekend. Anyone who hangs intake on a fixed clock time ("always 10 p.m.") hits something different on Saturday than on Tuesday. Tying it to the action rather than to the clock is therefore more reliable: put the tablet where the evening ends anyway.
For the jet lag statement a sequence of its own applies: first day of travel close to bedtime, then on the first few days after arrival — each time relative to bedtime at the destination, not at home. The suitable strength for this is the smallest: melatonin 0.5 mg meets the condition of at least 0.5 mg with a single tablet.
Anyone wanting to arrive at exactly 1 mg for the statement on falling asleep takes a divisible tablet — with melatonin 2 mg with a score line the half tablet corresponds to the condition. The melatonin category gives an overview of the available strengths.
Light in the evening is part of the timing
The body forms melatonin itself, and that formation is inhibited by light — above all by bright, short-wavelength light of the kind screens and ceiling fittings give off. That is the reason the pineal gland starts producing in the evening at all: it gets dark.
A tablet changes nothing about this. It brings into the circulation an amount far above what arises on its own at night — but it does not switch off a lamp. If the timing is to be right, the half hour before going to bed therefore belongs to it: dimmed light instead of ceiling lighting, screen rather put aside. That costs nothing and is the only part of the evening you can influence without a product.
What the timing does not achieve
Two things are regularly confused.
Topping up during the night. Anyone who wakes at three in the morning and then takes a tablet places the level in the second half of the night — that is, precisely where it is supposed to be falling soon anyway. The authorised statement refers to the moment before going to bed, not to a top-up in the middle of the night.
The morning after. Residual substance in the blood can make itself felt the following day; the German Federal Institute for Risk Assessment names in its opinion No 42/2024, among other things, next-day sleepiness, headache, reduced attention and prolonged reaction times as undesirable effects — including at amounts of 1 mg and below. The later in the evening intake happens, the closer that moves to the alarm clock. How long melatonin remains detectable after intake is set out in Melatonin duration: how long does it act in the body?.
The same institute advises certain groups against use on their own initiative: children and adolescents, pregnant and breastfeeding women, people with impaired liver or kidney function or with epilepsy, and people taking antihypertensives or anticoagulants. Anyone taking medicines regularly does well to clarify the timing with a doctor — also because of possible interactions.
Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.
The short version
- The authorised statement says close to bedtime — the reference point is bedtime, not the clock.
- With immediate-release tablets, 20 to 30 minutes beforehand is close to practice.
- The rule of 1 to 2 hours comes from the prolonged-release tablet and belongs to its delayed release.
- A meal delays absorption noticeably — one to two hours' distance from the large evening meal.
- Dimmed light in the last half hour is part of the timing.
Frequently asked questions
How long before bedtime should I take melatonin?
With an immediate-release tablet, about 20 to 30 minutes beforehand. The authorised statement phrases it as "close to bedtime" and gives no number of minutes; the range follows from the fact that the peak level is reached after roughly 15 to 90 minutes. With a prolonged-release tablet the figure in the product information applies, that is 1 to 2 hours.
On an empty stomach or after eating?
For the fast tablet, distance from the last larger meal makes sense, because food delays absorption — in the product information for Circadin the peak concentration shifts from 0.75 to 3.0 hours. A small snack does no harm. If the pack expressly says "after a meal", that instruction applies.
Always take it at the same clock time?
Better at the same place in the evening routine. The condition ties in to the distance from going to bed, and for most people bedtime shifts at the weekend anyway.
And if I have forgotten it and am already in bed?
Then the moment can no longer be hit — intake should lie before going to sleep, not after. A missed portion is not made up for, and certainly not doubled during the night.
Matching products from our range
- Melatonin 0.5 mg – 365 tablets
- Melatonin 2 mg, divisible to 1 mg – 180 tablets
- View all melatonin products
Sources: Regulation (EU) No 432/2012 (authorised health claims, melatonin: time taken to fall asleep 1 mg close to bedtime, jet lag at least 0.5 mg); product information Circadin 2 mg prolonged-release tablets (dosage 1–2 hours before bedtime after the last meal; effect of food Tmax 3.0 h vs. 0.75 h, Cmax 1020 vs. 1176 pg/ml); Harpsøe et al., "Clinical pharmacokinetics of melatonin: a systematic review", Eur J Clin Pharmacol 2015 (PubMed 26008214); German Federal Institute for Risk Assessment, opinion No 42/2024 on food supplements containing melatonin.
