Yes, wine contains melatonin, but in trace amounts far too small to affect your sleep. Red wines typically contain between 13 and 348 nanograms per milliliter, while white wines range from about 1 to 231 nanograms per milliliter. To put that in perspective, the European Food Safety Authority says you need at least 1 milligram of melatonin to meaningfully reduce the time it takes to fall asleep. A standard glass of red wine delivers roughly a thousand times less than that threshold.
Where the Melatonin Comes From
Wine’s melatonin has two sources: the grapes themselves and the yeast that ferments them. Grapes naturally produce small amounts of melatonin in their skins, and during fermentation, certain yeast strains synthesize additional melatonin from tryptophan, an amino acid present in the grape juice.
Not all yeast strains produce melatonin equally. In lab testing, only some common winemaking yeasts were capable of synthesizing it, and the amount they produced depended heavily on sugar concentration, tryptophan availability, and what growth phase the yeast was in. This means two wines made from identical grapes but fermented with different yeast can end up with very different melatonin levels.
Red Wine vs. White Wine
Red wines consistently contain more melatonin than whites. One large analysis of wines sold in Spain found red wine concentrations roughly 2 to 10 times higher than white wines, with all samples clustering neatly by wine type. The likely explanation is skin contact. Red wines are fermented with their grape skins for days or weeks, giving more time for melatonin and its precursors to leach into the liquid. White wines have minimal skin contact before fermentation begins.
Within red wines, the range is enormous. Some studies have measured concentrations as low as 0.14 nanograms per milliliter in certain single-varietal reds, while others found levels above 400 nanograms per milliliter. Grape variety, growing conditions, vineyard management, and winemaking technique all play a role. Researchers have even shown that treating grapevines with a plant defense compound called benzothiadiazole can boost melatonin levels in the harvested grapes.
How Much Your Body Actually Absorbs
The oral bioavailability of melatonin from wine is not well established. In a randomized clinical trial, participants who drank a glass of melatonin-enriched red wine showed a slower decline in blood melatonin levels compared to a control group, with a plateau between 30 and 60 minutes after drinking. But the effect was modest. Researchers noted that the melatonin appeared to work partly through direct absorption in the mouth lining rather than through the gut and bloodstream, and the amount that reached systemic circulation was extremely low.
Saliva melatonin levels showed a small peak about 45 minutes after drinking the enriched wine, but the difference was not statistically significant. The researchers concluded that wine’s melatonin content can measurably slow the natural nighttime drop in blood melatonin, but the actual dose absorbed is tiny compared to what a supplement delivers.
Wine Melatonin vs. a Supplement
The math here is straightforward. A typical melatonin supplement contains 1 to 5 milligrams. Even a low-dose supplement of 0.3 milligrams, which research suggests is enough to produce normal nighttime blood levels, contains 300,000 nanograms. A generous glass of red wine (about 150 mL) at the highest measured concentration of around 350 nanograms per milliliter would deliver roughly 52,000 nanograms, or 0.052 milligrams. That is about one-sixth of the lowest effective supplement dose, and most wines contain far less melatonin than the highest-tested samples.
More importantly, your body may not absorb wine melatonin the same way it absorbs a supplement. The complex mixture of alcohol, acids, tannins, and sugars in wine likely affects how much melatonin makes it into your bloodstream intact.
Why It Won’t Help You Sleep
Even if wine delivered a meaningful dose of melatonin, the alcohol would cancel it out. Ethanol disrupts sleep architecture: it may help you fall asleep faster, but it fragments the second half of the night, reduces REM sleep, and lowers overall sleep quality. A peer-reviewed analysis in the journal Nutrients made this point explicitly, noting that the ethanol content of wine “effectively counteracts any possible benefit from the trace amounts of melatonin or resveratrol present.”
Drinking wine for its melatonin content is, in practical terms, counterproductive if better sleep is your goal.
The Antioxidant Angle
Where wine’s melatonin may matter is not sleep but antioxidant activity. Melatonin is a potent free-radical scavenger. It neutralizes several types of reactive oxygen species and also stimulates the body’s own antioxidant enzymes while suppressing enzymes that generate oxidative stress. In wine specifically, melatonin appears to work synergistically with polyphenols, the better-known antioxidant compounds in red wine. It helps protect polyphenols from breaking down by binding to metal ions that would otherwise trigger their oxidation.
Research has shown that adding melatonin during winemaking increases the wine’s total phenolic content and antioxidant capacity, likely by shielding sensitive compounds from degradation during fermentation and aging. Some scientists see wine’s melatonin as a small but meaningful contributor to the antioxidant profile that has made moderate red wine consumption a point of interest in studies on the Mediterranean diet and cardiovascular health. That said, the concentrations involved are still very small, and no one has established that the melatonin in a glass of wine produces a measurable antioxidant effect in the human body after drinking.