Melatonin: spray or tablet?
Futures Nutrition Editorial Team · 11 August 2026
Melatonin: spray or tablet?
11 August 2026
The short answer: a spray gets melatonin into the blood faster and to a higher peak, while a tablet states more precisely how much melatonin was actually taken. Both are real differences, but only one of them can be read off the pack. And the figure the authorised claim is tied to is not the dosage form but the amount per portion — which nobody can read off a spray bottle without first counting sprays.
What technically separates the two forms
A swallowed tablet takes the ordinary route: stomach, small intestine, portal vein, liver. In the liver a large share of the melatonin is broken down before it ever reaches the circulation — the so-called first-pass effect. Of an oral amount in the range of 2 to 4 mg, only about 15 per cent therefore reaches the bloodstream, and that share varies considerably between individuals.
A spray starts one step earlier. It is sprayed under the tongue or against the inside of the cheek; part of the melatonin is taken up there directly through the well-supplied oral mucosa and bypasses the passage through the liver.
The important addition to that is rarely supplied: no spray is purely sublingual. Whatever is not absorbed through the mucosa within a short time is swallowed with the saliva and then takes exactly the route a tablet takes. How large that share is depends on the formulation, on how long the liquid stays in the mouth, and quite simply on whether someone swallows immediately after spraying. A spray is therefore not a different mode of absorption but a mixture of two routes.
What the evidence actually shows
The most-quoted investigation on this comes from 2023 (Drugs R&D). Fourteen healthy men received, in a crossover design on two occasions, once an immediate-release sublingual spray with 1 mg of melatonin (two sprays) and once a prolonged-release tablet with 1.9 mg. Melatonin levels in the blood were measured.
| Measured value | Sublingual spray (1 mg, immediate) | Prolonged-release tablet (1.9 mg) |
|---|---|---|
| Peak blood level (Cmax) | 2332 ± 950 pg/ml | 1151 ± 565 pg/ml |
| Time to peak (Tmax) | 23.3 ± 6.5 minutes | 64.2 ± 44.2 minutes |
| Share reaching the circulation | higher | lower |
The result is unambiguous — and it is still regularly reported wrongly. What was compared here was an immediate-release form against a prolonged-release form. A prolonged-release tablet is built to give off its content over hours; a low, late peak is not a shortcoming in such a tablet but the purpose of the construction. The comparison therefore describes two release profiles in the first place, and "spray versus tablet" only in the second.
An ordinary, non-prolonged-release melatonin tablet — and that is the form sold as a food supplement — lies between those two curves: faster than a prolonged-release product, slower than a spray. Anyone reading from the study that a spray is "twice as good" as a tablet is comparing the spray with the slowest kind of tablet there is.
Second limitation: fourteen healthy men are a small group. The spread in the table — ± 950 pg/ml for the peak, ± 44 minutes for its timing — is larger than some of the differences argued over in advertising.
Dosing accuracy: the difference that counts in daily use
This is the more important point in practice, and it falls in favour of the tablet.
A tablet carries a fixed amount. It can be counted, halved if it has a score line, and the figure on the pack applies to every single piece until the container is empty. With a spray, by contrast, the amount is the result of a calculation: milligrams per spray times number of sprays. That calculation assumes every stroke delivers the same amount — and that depends on conditions nobody controls in everyday use: whether the pump was primed sufficiently before first use, whether the bottle is held upright, how full it still is, and whether the last remainder in the dip tube is still delivered cleanly at all.
On top of that comes a finding that applies to both forms but shows what a declaration is worth. An analysis in the Journal of Clinical Sleep Medicine (2017) examined 31 melatonin-containing products from 16 brands on the Canadian market — liquids, capsules and chewable tablets. The actual content ranged from 83 per cent below to 478 per cent above the figure on the label; 71 per cent of the products missed their own declaration by more than ten per cent. Between two batches of the same product the difference was as much as 465 per cent. In 26 per cent of the samples serotonin was also found, which does not belong there.
That sample comes from Canada and cannot be transferred one to one to the European market, where food supplements are subject to different requirements. The lesson is transferable nonetheless: a number on the pack is only as good as the manufacturing behind it — and the more calculation steps lie between the pack statement and the actual portion, the more can come in between.
| Criterion | Tablet | Spray |
|---|---|---|
| Amount per portion | fixed, countable | result of sprays × mg per spray |
| Divisibility | possible with a score line | only via the number of sprays |
| Time to peak blood level | longer | shorter |
| Route of absorption | entirely via the gastrointestinal tract | partly oral mucosa, partly swallowed |
| Dependent on handling | hardly | yes (priming, position, fill level) |
| Further ingredients | pressing aids | solvents, flavourings, sweeteners, sometimes alcohol |
| After opening | keeps for a long time | limited period of use |
| Can be taken without water | no | yes |
The authorised claim is tied to the amount, not to the form
For melatonin, European food law has an authorised claim on the time taken to fall asleep, and it is tied to an amount — not to a dosage form:
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.
A spray may therefore carry this claim just as a tablet may — provided the number of sprays stated as a portion adds up to 1 mg. There is no authorisation granting one form a stronger statement than the other. Anyone comparing two packs who wants to know what they are buying therefore looks not at the word "spray" or "tablet" but at the nutrition table and the line "per portion". Why that figure is also the only comparable quantity between the strengths is set out in detail in Melatonin dosage: 0.5, 1, 2, 5 or 10 mg?.
Anyone wanting to hit the 1 mg from the condition precisely has the shortest route there with a divisible tablet: the melatonin 2 mg with a score line gives exactly that amount when halved, without conversion and without counting.
When each form fits in practice
In favour of a spray: it works without water, which is a genuine advantage when travelling and on a plane. Anyone who has difficulty swallowing tablets copes more reliably with it. And the faster rise is measurably there, even if the gap to an ordinary tablet is smaller than the study comparison with a prolonged-release product suggests.
In favour of a tablet: the fixed, readable amount, the divisibility, the shelf life even once the pack is open, and the short ingredient list. A spray needs solvents, usually flavourings and sweeteners, sometimes ethanol — ingredients a pressed tablet does without. Anyone who keeps a glass of water by the bed anyway loses nothing by swallowing except a few minutes of onset time, and those can be offset by the timing of intake.
Our range contains tablets only — from melatonin 0.5 mg up to the highest strength; we do not stock a melatonin spray. The reason is the one described above: with a tablet the portion is printed on the pack, with a spray what is printed there is an arithmetic problem. The melatonin category gives an overview of all strengths.
Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.
The short version
- A spray rises faster and higher — that is measured and undisputed.
- The best-known comparison set an immediate-release spray against a prolonged-release tablet, not against an ordinary tablet. The gap in everyday use is smaller.
- No spray is purely sublingual — part of it is swallowed and takes the same route as a tablet.
- The amount per portion is counted with a tablet and calculated with a spray.
- The authorised claim is tied to 1 mg per portion, not to the dosage form.
Frequently asked questions
Does a melatonin spray act faster than a tablet?
Yes, the rise is faster. In the 2023 investigation the peak blood level was reached after about 23 minutes, with the prolonged-release tablet compared against it after about 64 minutes. Against an ordinary, non-prolonged-release tablet the difference is smaller, because such a tablet also releases its content at once.
Is a spray easier to dose accurately than a tablet?
No, rather the opposite. With a spray the amount follows from the number of sprays and the amount per stroke, and that amount depends on priming, position and fill level. A tablet carries a fixed figure that does not change with handling.
How can I tell how much melatonin is in a spray?
From the nutrition table, the line "per portion", together with the statement of how many sprays make up a portion. Only both figures together give a number of milligrams. If the bottle states only "mg per 100 ml", the portion cannot readily be derived from it.
Can a spray simply be swallowed instead of sprayed?
It can, but then it is in substance a liquid intake via the gastrointestinal tract — the one advantage over the tablet, faster absorption through the oral mucosa, is lost. Anyone who swallows the content anyway gains nothing from the more elaborate dosage form.
Matching products from our range
- Melatonin 2 mg, divisible to 1 mg – 180 tablets
- Melatonin 0.5 mg – 365 tablets
- View all melatonin products
Sources: Regulation (EU) No 432/2012 (authorised health claims, melatonin: time taken to fall asleep 1 mg); Ait Abdellah S. et al., "Bioavailability of Melatonin after Administration of an Oral Prolonged-Release Tablet and an Immediate-Release Sublingual Spray in Healthy Male Volunteers", Drugs R&D 23(3), September 2023, pp. 257–265 (PMID 37438493); Erland L.A.E., Saxena P.K., "Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content", Journal of Clinical Sleep Medicine 13(2), 2017, pp. 275–281.
