Wine Sulfites and Headaches: What the Evidence and the Standard Say

Wine sulfites and headaches are a fixed pair in after-dinner conversation: someone swears red wine gives them a migraine because of the sulfites, and someone else nods. The medical evidence and the health rules tell a different story, with more nuance and more data: sulfite sensitivity exists and is regulated, but the headache after wine has other, better-documented suspects. This guide sums up what health authorities and peer-reviewed studies say, with no bar advice.

Let us start with the basics. Sulfites are sulfur-derived compounds (sulfur dioxide and its salts) that wine contains by two routes: fermentation produces them naturally, and the winemaker can add them as a preservative, because they slow oxidation and the growth of unwanted bacteria and yeasts. The U.S. alcohol regulator, the TTB, says it plainly in its labeling guide: they are widely used preservatives in winemaking, and precisely for that reason it requires declaring them.

And there is a point that changes the discussion from the start: all wine contains sulfites, including wine that has none added. The same TTB guide records naturally occurring sulfites in wines and does not allow phrases like sulfite-free on the label. What exists are wines with fewer added sulfites, a topic we develop in the guide to natural, organic and biodynamic wines in Mexico.

01What are sulfites and what are they used for in wine?

Sulfur dioxide does two jobs in the winery. As an antioxidant, it captures oxygen before it damages the wine's aromas and color. As an antiseptic, it keeps at bay microbes that would turn wine into vinegar or something worse. Without it, many wines would not reach the table in good condition from the winery, especially whites and sweet wines, which are more fragile. Sparkling wines also depend on that protection to arrive stable. The Mexican styles, from brut nature to sweet, are in the sparkling wine guide.

The amounts are limited by rule. In the public discussion of the Mexican standard for alcoholic beverages, published in the Diario Oficial de la Federación (Mexico's official gazette), the standard of the International Wine Code is cited: a maximum of 150 mg/L of total SO2 for reds and 200 mg/L for whites and rosés, in dry wines. The order makes winemaking sense: red wine brings its own antioxidants, the tannins and the pigments of the grape skins, and needs less chemical help, while white and sweet wines need more protection. Whites that macerate with their skins (the Mexican orange wine is the local case) gain tannins and, with them, some natural defense.

It is worth keeping that fact in mind, because it will be key later: the wine style with the most sulfites allowed is white, not red. And the style people blame for their headache is, almost always, red. The guide to Mexican white wines shows precisely those fresh, delicate styles that depend most on the preservative to arrive in good form in the glass.

02What does the Mexican standard require you to declare?

In Mexico, the labeling of alcoholic beverages is governed by NOM-142-SSA1/SCFI-2014. In the responses to comments on that standard, published in the DOF, the Secretaría de Salud (Health Ministry) stated that the label statement contiene sulfitos (contains sulfites) is mandatory when the concentration exceeds 10 mg/kg, a threshold aligned with the Codex Alimentarius and with the international labeling standard of the International Organisation of Vine and Wine.

The document also holds a revealing detail: the Consejo Mexicano Vitivinícola (Mexican Wine Council) itself asked that the statement not be made mandatory, and the authority did not accept. The health criterion prevailed: at those concentrations, sulfites can cause reactions in sensitive people and the consumer has a right to know. The practical lesson is that the Mexican label already gives you the tool. If you want to review everything a back label says, the guide to how to read a wine label covers it.

The United States applies the same logic with the same number: the TTB requires the declaration when wine contains 10 parts per million or more of total sulfur dioxide, and offers the optional statement Contains less than 10 ppm only after analysis by its own laboratory. Two jurisdictions, one threshold: 10 milligrams per kilo or liter is the line from which a sulfite is declared.

03Does sulfite sensitivity exist?

This is where precision is needed, because the myth feeds on two opposite errors: believing that nobody reacts to sulfites and believing that all of us do. The review by Vally and Thompson, published in a peer-reviewed journal in 2012, sums up the clinical evidence: most studies place the prevalence of sulfite sensitivity between 3% and 10% of people with asthma, with higher risk in those who depend on steroids or have highly reactive airways. In people without asthma, adverse reactions are extremely rare.

The documented symptoms of that sensitivity are mostly respiratory (bronchospasm, wheezing) and, to a lesser degree, skin and digestive: hives, flushing, abdominal pain, diarrhea. The same review recalls that in 1986 the FDA banned sulfites on fruits and vegetables served raw, after serious cases at salad bars, and set the obligation to declare them from 10 ppm in the products where they are still allowed.

What that clinical profile does not describe is the classic bar-stool complaint: one glass of red and a headache an hour later, in someone without asthma and without other reactions. Reactions to sulfites tend to be quick and to show up in the airways or on the skin, and people who have them usually also react to other foods with sulfites, such as dried fruit, some shrimp and processed potatoes, which can carry as much as wine or more. If dried apricots do nothing to you and red wine does, the clue usually points elsewhere.

04So what causes the wine headache?

The medical literature has three candidates with more evidence than sulfites, and none is exotic.

The first is alcohol itself. It is a vasodilator and a diuretic: it widens blood vessels and dehydrates, two direct paths to a headache, and it does so with any alcoholic drink, red wine or gin. The review on migraine and alcohol published in Nutrients in 2025 describes the typical picture of the red wine headache: it appears between 30 minutes and 3 hours after consumption, and one or two glasses can be enough, a modest dose of ethanol, which suggests that other compounds are involved in red wine as well.

The second candidate is biogenic amines, mainly histamine, more abundant in red than in white. Here the evidence is honestly mixed. A double-blind study by Kanny and colleagues (2001), in 16 people with self-reported wine intolerance, compared a low-histamine wine with a histamine-rich one and found no correlation between histamine content and reactions. The 2025 review qualifies the picture: people with a deficiency of the DAO enzyme, which breaks down histamine, do show more migraine and a better response to low-histamine diets, which suggests a real but small subgroup.

The third and most recent is quercetin. A team from the University of California, Davis published in 2023, in Scientific Reports, a plausible mechanism: quercetin-3-glucuronide, the form this flavonol from grape skin takes when the body processes it, inhibits the ALDH2 enzyme, which is in charge of clearing acetaldehyde. With the enzyme held back, acetaldehyde, which is toxic and inflammatory, builds up, and its known effects are facial flushing, nausea and headache. Red wine carries much more quercetin than white because it ferments with the skins. The authors stress that proof in humans is missing and present the finding as a plausible mechanism, still to be confirmed.

Tannins, the traditional scapegoat, have been proposed as a cause with less backing than the others: tea and chocolate also have them in abundance and do not carry the same reputation.

05Why does red hurt more if it has fewer sulfites?

Putting the earlier pieces together, there is a check anyone can do at their own table. If sulfites were the cause of the headache, white and sweet wine, with higher limits allowed, should hurt more than red. The opposite happens: the classic complaint is about red, the wine with fewer sulfites and with more quercetin, amines and tannins, the three candidates of the previous section. The soft and sweet red wines also illustrate that within red itself there are different worlds of tannin and sugar, and personal tolerance changes from one to another. The home check gains rigor if done blind: the guide to how to taste wine explains how to set up a comparative tasting without the label tilting you.

It is worth repeating the nuance before going on: this reasoning holds for most people, not for all. The asthmatic subgroup with demonstrated sulfite sensitivity exists, and for those people avoiding them is a serious indication, not a fad. What the evidence does not support is the leap from the idea that some people react to sulfites to the claim that sulfites cause the wine migraine in the general population. It is the same conclusion we gave in the natural wine guide: alcohol, dehydration and histamines weigh more in the hangover of most people.

06What should you do if you suspect sulfites make you feel bad?

The reasonable path does not involve self-diagnosing at the bar. The Cleveland Clinic describes the real procedure: there is no reliable blood or skin test for sulfite sensitivity. The diagnosis is made by an allergist with the clinical history and, where appropriate, a controlled, supervised challenge test, with medication ready in case the reaction escalates. In the meantime, the label is your ally: in Mexico and in the United States, contains sulfites above 10 mg/kg is mandatory, and wines with fewer added sulfites (many natural wines advertise it) declare it on the back label.

There are also common-sense measures that need neither a doctor nor a label: drinking with food (the guide to pairing wine with Mexican food settles what to serve), alternating each glass with a glass of water and respecting the dose. Dehydration is fought with water, not with another wine, and one glass less is the preventive measure with the most accumulated evidence in this whole guide.

And a side but practical recommendation: wines with fewer added sulfites oxidize sooner once uncorked, so if you choose that route, adjust the timing of the bottle too. The guide to how long an open bottle lasts has the windows by style. And anyone who chooses an alcohol-free wine should know it can also carry sulfites.

07Is this medical advice?

No. This article sums up regulatory sources and peer-reviewed studies for informational purposes. It does not diagnose and does not replace the assessment of a health professional. If you have asthma, recurrent migraine or suspect a reaction to sulfites or to any component of wine, see a doctor before experimenting with your own tolerance.