You open a bottle of red, enjoy a glass or two, and wake up the next morning with a pounding headache. The bottle says "contains sulfites" right there on the label. Case closed, right?
Not quite. The idea that sulfites cause wine headaches is one of the most persistent myths in the drinks world — and the science tells a more complicated story. If you've been avoiding sulfite-containing wines hoping to dodge the dreaded wine headache, this article is worth a read before your next bottle.
What Are Sulfites, and Why Are They in Wine?
Sulfites (also written as sulphites) are compounds containing sulfur dioxide (SO₂). They've been used in winemaking for centuries as a preservative and antioxidant — they prevent wine from oxidising, inhibit unwanted bacteria, and extend shelf life.
Almost all wines contain some sulfites, including "natural" and organic wines. In fact, wine fermentation produces sulfites naturally as a byproduct, even with zero additives. Winemakers typically add more during bottling to protect the wine during transport and storage.
Sulfite levels by wine type (approximate):
| Wine Type | Typical SO₂ Level |
|---|---|
| Conventional white wine | 100–200 ppm |
| Conventional red wine | 50–150 ppm |
| Natural / low-intervention wine | 10–80 ppm |
| Dried fruits (e.g. raisins) | Up to 1000 ppm |
| Fruit juices and cordials | 50–350 ppm |
Note that dried fruits and many processed foods contain far more sulfites than wine — yet you don't hear people blaming their trail mix for morning headaches.
So Do Sulfites Actually Cause Headaches?
Here's where the science gets interesting: there is no strong clinical evidence that sulfites cause headaches in healthy adults.
Sulfites can cause genuine reactions — but mostly in people with sulfite sensitivity or asthma, and the symptoms are typically respiratory (wheezing, tightness) rather than headaches. True sulfite sensitivity affects an estimated 1% of the general population, and around 5% of people with asthma.
A few key points that challenge the sulfite-headache theory:
- White wines generally contain more sulfites than reds, yet red wine is far more commonly blamed for headaches. If sulfites were the cause, white wine drinkers should suffer more — but they typically don't.
- People who eat dried fruits, cured meats, and packaged foods — all higher in sulfites than wine — rarely report headaches from those foods.
- Controlled studies have not been able to reliably reproduce headaches in subjects exposed to sulfites alone.
Then What Is Actually Causing Wine Headaches?
If not sulfites, what's going on? Researchers and wine scientists point to several more likely culprits.
1. Histamines
Red wine is rich in histamines, naturally occurring compounds produced during fermentation. People with low levels of the enzyme diamine oxidase (DAO) — which breaks down histamines — are more sensitive to histamine-rich foods and drinks, including red wine, aged cheese, and fermented foods.
Histamine reactions can cause headaches, flushing, nasal congestion, and skin reactions. If you regularly react to aged cheese, cured meats, or fermented foods as well as wine, histamine sensitivity may be the culprit.
2. Tannins
Tannins are polyphenols found in grape skins, seeds, and stems — and they're much more concentrated in red wines than whites. They've been linked to the release of serotonin in some individuals, which at varying levels can trigger headache responses, particularly in people prone to migraines.
Tannin-sensitive individuals often find that bold, tannic reds like Cabernet Sauvignon or Malbec cause more head pain than lighter reds like Pinot Noir or Gamay.
3. Alcohol Itself
This one is obvious but often overlooked. Ethanol is a vasodilator — it widens blood vessels, which can directly trigger headaches. It also causes dehydration by suppressing the hormone that tells your kidneys to conserve water, leading to the classic hangover headache.
Even one or two glasses can produce a mild dehydration effect, particularly in a warm environment or if you haven't had enough water during the day. For many people, the "wine headache" is simply a mild hangover that arrives faster than expected.
4. Quercetin
More recent research has pointed to quercetin, a flavonoid antioxidant found in grape skins. When metabolised, quercetin breaks down into quercetin glucuronide, which some research suggests may interfere with the body's ability to process alcohol — leading to acetaldehyde buildup, which is associated with headaches, flushing, and nausea. Grapes grown in sunnier conditions (and therefore higher-UV environments) produce more quercetin, which may partly explain why some wines hit harder than others.
5. Congeners
Congeners are chemical byproducts of fermentation and aging — things like acetaldehyde, methanol (in trace amounts), and fusel alcohols. Darker, more complex drinks like red wine, whisky, and brandy contain more congeners than clear spirits or white wine. Congeners are well-established contributors to hangover severity.
Why Do Some People Headaches Only from Wine and Not Other Alcohol?
This is a fair question. A few reasons:
- Drinking pace — wine is often sipped over a meal, but glasses can add up subtly without you noticing
- Food pairing — certain foods eaten alongside wine (aged cheese, charcuterie) are themselves high in histamines or tyramine, compounding the effect
- Individual biochemistry — enzyme levels (particularly DAO and alcohol dehydrogenase) vary significantly between people
- Expectations and context — psychological priming can influence how we experience physical symptoms
What About "Natural" or Low-Sulfite Wines?
Natural wines have grown popular partly on the promise of being hangover- and headache-friendly. They typically contain fewer added sulfites — but that doesn't automatically make them headache-free.
In fact, natural wines:
- Still contain naturally produced sulfites from fermentation
- May contain higher levels of histamines and biogenic amines due to less controlled fermentation
- Can be more microbiologically unstable, meaning more varied and sometimes unexpected compounds in the bottle
Some people genuinely feel better drinking natural wines. Whether that's due to lower sulfites, lower overall alcohol content, different winemaking practices, or the placebo effect of mindful drinking — the evidence is still thin.
How to Reduce Your Chances of a Wine Headache
Whether your sensitivity comes from histamines, tannins, dehydration, or plain old alcohol, these strategies help:
- Hydrate — drink a glass of water for every glass of wine
- Don't drink on an empty stomach — food slows alcohol absorption
- Try lighter reds or whites — lower tannin, lower alcohol options like Pinot Noir, Gamay, or Pinot Grigio
- Pace yourself — one glass per hour gives your liver time to process alcohol properly
- Take an antihistamine before drinking — if histamine sensitivity is suspected, some people find this helps (consult your doctor first)
- Avoid mixing wine with high-histamine foods — aged cheese, cured meats, and fermented foods all add to your histamine load
Common Myths About Sulfites and Wine, Debunked
"If it says 'contains sulfites,' it's bad for me." Almost all wine contains sulfites. The label is a regulatory requirement, not a health warning.
"Organic wine is sulfite-free." Organic winemaking limits added sulfites, but doesn't eliminate naturally occurring ones. Certified organic wines in most countries still permit low levels of SO₂.
"Cheap wine has more sulfites." Price doesn't directly correlate with sulfite levels. Some very fine wines are heavily sulfited to protect their structure over decades of aging.
"I'm definitely allergic to sulfites." True sulfite allergy is rare. What most people experience is sensitivity, and even then, sulfites are unlikely to be causing your headache specifically.
The Bottom Line
Sulfites make a convenient scapegoat, but the evidence that they cause headaches in healthy people is weak. The more likely culprits are histamines, tannins, alcohol itself, dehydration, and compounds like quercetin — all of which vary from wine to wine and person to person.
If wine consistently gives you headaches, the most useful thing you can do is experiment: try different grape varieties, wine styles, and alcohol levels, and pay attention to what you're eating alongside. Your pattern of reactions will tell you far more than any label ever will.
And if you want to be safe? Drink water, eat well, and go easy on the pour.
Interested in more wine science and drink guides? Browse our articles on wine pairing, low-alcohol options, and how to read a wine label.