“Contains sulfites” means the wine has 10 parts per million (ppm) or more of sulfur dioxide, which works out to 10 milligrams per liter. It’s a mandatory declaration in the US, the EU and the UK, there for the small number of people who react to sulfites. It isn’t a warning that something is wrong: nearly every wine carries it, organic wines included.
What the label doesn’t tell you is how much. A natural wine at 15 ppm and a dessert wine at 300 ppm print exactly the same line. To make sense of it, you need to know why winemakers use sulfites, how much the law allows, and what “organic” and “sulfite free” actually promise.
What does “contains sulfites” mean on a wine label?
It’s a declaration for sensitive drinkers, nothing more. The threshold is 10 ppm on both sides of the Atlantic, with small differences in the detail:
- In the US, the Alcohol and Tobacco Tax and Trade Bureau (TTB) requires “Contains sulfites” (or “Contains sulfiting agents”) on any wine with 10 ppm or more of total sulfur dioxide. A wine can only skip the statement if a lab test shows it’s below 10 ppm, and the TTB asks for that proof before it approves the label.
- In the EU, sulfites are one of the allergens that must be declared. The statement has been mandatory since 25 November 2005 for wines with more than 10 mg per liter. French labels say “contient des sulfites”, Italian ones “contiene solfiti”, and so on.
- In the UK, where sulfites are a declared allergen too, it’s spelled “sulphites”, with the same 10 mg per liter trigger.
Wines sold in the EU and produced since 8 December 2023 also have to give an ingredient list and a nutrition declaration. Producers can move the full ingredient list and nutrition table to a QR code, but two things must stay printed on the physical label: the energy value, in other words the calories, and the allergens, which means sulfites.
On spec sheets and ingredient lists, sulfites go by other names too: SO2, sulfur dioxide, or potassium metabisulfite, the powder many winemakers use in the cellar. For the rest of the bottle, here’s how to read a wine label.
Why do winemakers add sulfites to wine?
Sulfur dioxide is the most widely used protective tool in the cellar. It has three main jobs.
- Antioxidant. It shields wine from oxygen. Without it, a white browns faster and its fresh fruit fades into bruised apple and nutty notes. That character is the whole point of an oxidative wine from the Jura, but not of a crisp Sauvignon Blanc.
- Antimicrobial. It holds back unwanted yeast and bacteria: acetic bacteria, which turn wine into vinegar when it’s exposed to air, and Brettanomyces, the yeast behind barnyard and sweaty-saddle smells.
- Stabilizer. It helps stop a wine that still contains sugar from re-fermenting in the bottle. That’s why sweet wines get more of it.
Winemakers also burn sulfur wicks inside empty barrels to keep them clean between uses, and many add a little at harvest, on the grapes or the juice, so the must doesn’t oxidize or start fermenting with the wrong microbes. It’s all part of standard winemaking.
One technical detail explains a lot. Part of the added sulfur dioxide binds to other molecules in the wine, such as sugars and acetaldehyde, and then does very little. Only the “free” portion really protects the wine. The law, however, caps total sulfur dioxide, free and bound together. That’s one reason sweet wines, where a lot of it gets bound, are allowed higher limits.
How much sulfite is in wine? The legal limits
In the US, wine can contain up to 350 ppm of total sulfur dioxide, whatever its color or sweetness. Europe sets limits by style instead. They’re much lower for dry wines, but a short list of sweet wines can go up to 400 mg/L, slightly above the US ceiling. Organic wine gets lower caps again.
| Type of wine | EU limit, conventional | EU limit, organic |
|---|---|---|
| Dry red (under 5 g/L of sugar) | 150 mg/L | 100 mg/L under 2 g/L of sugar, 120 mg/L from 2 to 5 g/L |
| Dry white or rosé (under 5 g/L of sugar) | 200 mg/L | 150 mg/L under 2 g/L of sugar, 170 mg/L from 2 to 5 g/L |
| Red with 5 g/L of sugar or more | 200 mg/L | 170 mg/L |
| White or rosé with 5 g/L of sugar or more | 250 mg/L | 220 mg/L |
| Some sweet wines named in the regulation (such as Sauternes, Barsac, Coteaux du Layon, Monbazillac, Alsace Vendanges Tardives and Sélection de Grains Nobles, Beerenauslese, Trockenbeerenauslese, Tokaji Aszú, Canadian Icewine) | 400 mg/L | 370 mg/L |
| Quality sparkling wine (Champagne, Crémant) | 185 mg/L | 155 mg/L |
For wine, one milligram per liter is effectively one ppm, so the two units are interchangeable here. In this table, “dry” means under 5 g/L of sugar, the threshold the sulfur dioxide rules use. It isn’t the label definition of “dry” for a still wine, which can stretch to 9 g/L depending on acidity. For organic wine, the 100 and 150 caps only apply below 2 g/L of sugar; above that, the organic rule is the conventional limit minus 30 mg/L, which gives the rest of the column. And between 250 and 400, other sweet wines named in the regulation get intermediate limits: 300 mg/L for a German Spätlese, for example, and 350 for an Auslese.
These are ceilings, not typical levels, and many wines sit well below them. Reds generally contain less than whites, because their tannins and other polyphenols already protect them from oxidation. The usual order, from least to most: dry red, then dry white and rosé, then sweet wines.
Organic wine and sulfites: the US and Europe disagree
This is where “organic” gets confusing, because the word means different things on either side of the Atlantic.
- USDA organic (with the seal): no added sulfites at all. This is the strictest organic definition in wine.
- “Made with organic grapes” (US): the grapes are certified organic, and the winemaker may add sulfur dioxide, up to 100 ppm in total. These wines can’t carry the USDA seal.
- EU organic (the green leaf logo): added sulfites are allowed, at the lower caps in the table above. Since the 2012 harvest, EU rules cover organic winemaking as well as grape growing.
So a European organic wine, even a very good one, will almost always say “contains sulfites”. For the wider rules, see our guide to organic wine, and for the bigger question, is organic wine better?
One myth to drop: organic wine does not have fewer sulfites because the vineyard uses less sulfur. Organic growers use sulfur too, against powdery mildew, plus copper against downy mildew. In a typical wine, almost all the sulfites come from sulfur dioxide added in the cellar, with a small share made by fermentation. Biodynamic standards such as Demeter go further than EU organic, with their own lower caps.
Is there such a thing as sulfite-free wine?
Not strictly, and it’s the most misunderstood part of the whole topic. Yeast makes a little sulfur dioxide during fermentation, usually a few milligrams per liter and sometimes more, depending on the strain and the juice. A wine with truly zero sulfites is rare.
So when a bottle or a shop says “sulfite free”, read it as “no sulfites added”. Traces are still possible. And if fermentation alone pushes a wine over the threshold (10 ppm or more in the US, more than 10 mg per liter in the EU), both require “contains sulfites” on the label, even though the winemaker added nothing.
The most reliable place to find these wines is natural wine. There is no legal definition of natural wine in the US or the EU, but since 2020 France has had a private label, Vin Méthode Nature. The French consumer-protection authority (DGCCRF) accepted its charter and logo, but it isn’t an official certification. Its rules include:
- certified organic grapes, picked by hand;
- native yeast only;
- no sulfites before or during fermentation;
- sulfites can only be added at bottling, and total sulfur dioxide in the finished wine must not exceed 30 mg per liter, checked by lab analysis.
The logo comes in two versions: plain “Vin Méthode Nature” for wines with no added sulfites, and “Vin Méthode Nature <30 mg/L” for wines that had any sulfites added at all. Other natural wine groups have their own rules, some stricter, some looser. And natural doesn’t mean untreated: the grapes are organic, so they’re usually sprayed with copper and sulfur in the vineyard, like most organic grapes.
The trade-off is fragility. A wine with no added sulfites handles heat and long shipping badly, and it’s more exposed to faults like mousiness or volatile acidity. Keep it cool and don’t forget it in the cellar for years.
Do sulfites cause headaches?
It’s the most common accusation, and for most drinkers it doesn’t hold up well. The likelier causes of a wine headache are elsewhere.
- The alcohol itself. It’s the prime suspect: it can widen blood vessels, it dehydrates you, and how much you drink makes a big difference.
- Histamine and other biogenic amines. They’re generally higher in reds than in whites, partly because of malolactic fermentation, and some people react to them.
- The red wine paradox. Plenty of people say red wine gives them a headache and white doesn’t, even though red usually contains fewer sulfites. A 2023 study from the University of California, Davis, suggested another explanation: quercetin, a compound more abundant in red wine, may interfere with how the body clears acetaldehyde, a toxic by-product of alcohol. It’s a hypothesis based on lab tests, not a settled answer.
Sulfite sensitivity is real, but uncommon. It mainly affects some people with asthma: France’s public health portal, Santé.fr, puts it at 5 to 10% of them. Reported reactions are mostly respiratory (wheezing, trouble breathing), sometimes skin or digestive, and some sensitive people also report headaches. Sulfites are taken seriously enough in the US that the FDA banned them on fresh fruit and vegetables meant to be eaten raw, back in 1986.
In 2022, the European Food Safety Authority (EFSA) re-evaluated sulfites used as food additives. It withdrew the temporary acceptable daily intake for lack of adequate data, and concluded that exposure among the highest consumers, from all food sources combined, could be a safety concern.
If you have asthma, or you’ve ever reacted after a glass of wine or a handful of dried fruit, talk to your doctor or an allergist. For everyone else, the old advice still works: a glass of water between glasses of wine, don’t drink on an empty stomach, and spit when you’re tasting a lot of wines in a row.
Dried fruit often has far more sulfites than wine
Wine is far from the only food with sulfites. You’ll also find them in dried fruit, shrimp and other shellfish, some fruit juices and syrups, vinegars, and some mustards.
Dried apricots are the striking example. EU rules allow up to 2,000 mg of sulfites per kilo in them, against 150 to 200 mg per liter for most wines. Sulfur is what keeps them bright orange; brown dried apricots usually haven’t been treated. A small handful of the orange ones, around 30 grams, can contain up to 60 mg of sulfites, against under 20 mg in a 125 ml glass of dry red, even at the EU’s legal limit.
How to find a low-sulfite wine
- Pick a dry red over a white or a sweet wine: on average, it’s the least sulfited style.
- In the US, look for the USDA organic seal for no added sulfites, or “made with organic grapes” for a 100 ppm cap.
- On European wines, look for the green leaf organic logo, a biodynamic certification, or the Vin Méthode Nature logo.
- Check the tech sheet. Many wineries list total SO2 for each wine.
- Ask your wine shop. It’s often the easiest way to find low-sulfite bottles that are actually good.
And if you’re curious about what else ends up in the bottle, our piece on vegan wine explains fining, the other big “what’s really in my wine” question.
Frequently asked questions
Why does wine say contains sulfites?
Because some people are sensitive to sulfites, so the law makes producers declare them. In the US, any wine with 10 ppm or more of sulfur dioxide must carry the statement, and Europe and the UK, where sulfites are a declared allergen, use the same 10 mg per liter threshold. Nearly every wine is above it, partly because winemakers add sulfur dioxide to protect the wine and partly because yeast makes a little on its own during fermentation.
Is there wine without sulfites?
Not completely. Yeast produces a few milligrams per liter of sulfur dioxide during fermentation, so 'sulfite free' really means 'no sulfites added'. Look for 'no sulfites added', USDA organic wine, or natural wine. If a wine with nothing added still ends up at 10 ppm or more from fermentation alone, it must say 'contains sulfites' anyway.
Do sulfites in wine cause headaches?
For most people, probably not. Headaches after wine are more likely to come from the alcohol itself, how much you drank, dehydration, and sometimes histamine. True sulfite sensitivity is real but uncommon, and it mostly affects some people with asthma, usually as breathing symptoms. If you react to wine or dried fruit, talk to a doctor.
Does red wine have more sulfites than white?
No, usually the opposite. Tannins and other polyphenols already protect red wine from oxidation, so it needs less sulfur dioxide. EU law reflects that: 150 mg per liter maximum for a dry red, 200 for a dry white or rosé. Sweet wines carry the most, up to 400 mg per liter for a few, such as Sauternes.
Is organic wine sulfite free?
It depends where it comes from. In the US, wine labeled 'organic' with the USDA seal cannot contain added sulfites, while 'made with organic grapes' allows up to 100 ppm. In the EU, organic wine can contain added sulfites, capped at 100 mg per liter for a red and 150 for a white or rosé with under 2 g/L of sugar, and at the conventional limit minus 30 for sweeter wines. Either way, traces from fermentation remain.
How much sulfite is allowed in wine?
In the US, up to 350 ppm of total sulfur dioxide. In the EU, 150 mg per liter for a dry red and 200 for a dry white or rosé, rising with sugar to 400 for a short list of sweet wines like Sauternes. EU organic caps are 100 and 150 for wines under 2 g/L of sugar, and the conventional limit minus 30 above that. Many wines sit well below their legal ceiling.
