What sulphites in wine actually are
Sulphites are sulphur-based compounds - primarily sulphur dioxide (SO2) - used as preservatives. They protect wine from oxidation and from bacteria that would otherwise make it undrinkable. Without them, most wines would degrade long before reaching you, especially after a journey across a border or two.
The thing that surprises almost everyone: sulphites are not an industrial invention. Fermentation produces a small quantity on its own. Every wine, including organic and natural ones, contains sulphites. What varies is how much the producer adds during winemaking.
EU law requires the phrase "contains sulphites" on the label whenever concentration exceeds 10 mg/l. The legal maximums are 150 mg/l for dry reds and 200 mg/l for dry whites - sweet wines can go higher. Those numbers already tell you something: whites and rosés tend to need more added sulphites than reds, because they are more vulnerable to oxidation without the protective buffer that tannins provide.
Talk to a producer who takes their work seriously and you find that the quantity of sulphites depends on the health of the grapes at harvest, the winemaking style, the type of wine, and how long it needs to last. Good work in the vineyard means less correcting in the cellar.
Do sulphites actually harm you?
The honest answer is: it depends on you. For the large majority of people, sulphites at the levels found in wine cause no problem at all. The most cited estimate, from the US FDA, puts sulphite sensitivity at around one person in a hundred. The figure is higher among people with asthma - a 1986 study by Bush and colleagues, published in the American Journal of Medicine, found a prevalence of 3.9% among asthmatic patients examined, and those were patients with severe cases, which suggests the rate among asthmatic people in general may be even lower.
The classic complaint - wine gives me a headache - almost always gets blamed on sulphites. The studies do not back that up clearly. Dried apricots, packaged fruit juices, and many cured meats contain sulphites at concentrations well above those in wine, yet nobody accuses a handful of apricots of ruining the next morning. The more plausible candidates are biogenic amines, histamine, or simply the amount of alcohol consumed.
Someone with a genuine sensitivity may notice hives, breathing difficulties, or stomach trouble. If you suspect you are in that group, talk to a doctor and ask for a specific test rather than cutting out wine on a guess.
One more thing worth saying plainly: the problem is often not the wine itself but the quantity and the context. A glass with dinner is one thing; a bottle on an empty stomach is another - and that is true regardless of the sulphite content.
How to find wines made with fewer sulphites
If you want to reduce your exposure, there are a few practical routes. Natural and biodynamic producers tend to add sulphites in minimal quantities, often only at bottling to protect the finished wine. It is not a guarantee, but the tendency is real.
You will also find wines labelled "no added sulphites". That does not mean zero sulphites - it means none were added during production. The sulphites produced naturally by fermentation are still there. These wines are more fragile and are meant to be drunk young; they are not candidates for a cellar.
On platforms such as Vino.com and Svinando you can filter by organic and natural wines, which points you towards producers paying attention to this. Do not expect a dedicated "zero sulphites" category, but browsing among natural and biodynamic labels you will often find technical sheets that give the actual mg/l figure.
There is also a simpler rule of thumb: dry aged reds generally carry fewer added sulphites than sweet whites. If you are sensitive, a tannic red from a small producer is likely easier going than a dessert-style Riesling from a large commercial range.
Is it worth factoring sulphites into which bottle you choose?
For most people reading this, no. If you have no confirmed sensitivity, sulphites in wine do not deserve much of your mental energy. They are present in regulated quantities, and the wines you find in a decent wine shop or on a serious online platform sit well within limits that the research considers safe for the general population.
That said, there is a more interesting reason to lean towards low-sulphite wines: they usually go hand in hand with a more careful approach to production. A producer adding very little sulphur is probably tending the vineyard more attentively, harvesting by hand, not relying on industrial selected yeasts. What ends up in the glass is often a wine with more character - not always better in an absolute sense, but more alive, more individual.
If you want to start exploring wines made with less intervention in the cellar, certified organic producers are a good entry point. It is not the only route, but it is a reliable one for finding bottles where added sulphites are kept to a minimum.
The best wine is the one you enjoy, understand and know how to pair. Sulphites are one part of a larger conversation, not the whole of it.
Domande frequenti
Why do white wines have more sulphites than reds?
Whites are more vulnerable to oxidation. Red wines have tannins that help protect them; whites do not, so they need more sulphur dioxide to stay stable during transport and time in the bottle. The EU maximum reflects this: 200 mg/l for dry whites against 150 mg/l for dry reds.
Is organic wine sulphite-free?
No. Organic wines can and do contain added sulphites, but EU organic regulations set lower maximum limits than those for conventional wine. Organic and "no added sulphites" are two separate things - a wine can be one without being the other.
Are sulphites really what causes a wine headache?
The evidence does not support it clearly. Headaches after wine are more plausibly linked to alcohol, biogenic amines such as histamine, or simply how much you drank. Many common foods contain sulphites at higher concentrations than wine without producing the same complaints.
How do I know how many sulphites a wine contains?
The label only has to say "contains sulphites" once the level exceeds 10 mg/l - it rarely states the exact figure. For that, look for the producer's technical sheet or contact them directly. Some natural producers list the mg/l on the label as a point of pride.
Can I order low-sulphite Italian wines if I live outside Italy?
Some of the platforms that list natural and organic Italian wine do ship internationally, but coverage varies by country and changes over time. Check the shipping destination on whichever platform you use before adding to your cart - the information will be current at checkout in a way that anything written here would not be.