Short answer: the question is why red wine gives some people a headache that white does not, and the answer is that nobody has proven it yet, but it is almost certainly not the sulfites, because white wine carries more of them and does not do it. The suspects are the alcohol, which is the usual culprit in a disguise; histamine, for a minority; and a grape compound called quercetin that sun-ripened reds carry and that may stop your body clearing the alcohol. The test is one glass of dry white on an empty Tuesday. The bottle that passes is a light red from a cool place. And the “no sulfites added” label will not save you; it only shortens the wine’s life.
The sticker
Every bottle in America says “contains sulfites,” because the law requires the words once the wine holds ten parts per million or more, and every wine does; yeast makes sulfites on its own, and winemakers add a little more to keep the wine from turning to vinegar. The warning is there for a real but small group: sulfite-sensitive asthmatics, about five percent of people with severe asthma, for whom the reaction is wheezing, not a headache. Nobody has shown sulfites cause headaches in anyone else, and the arithmetic is against it: white and sweet wines carry more sulfites than reds, and the people who get the red-wine headache drink Chardonnay without complaint. Dried apricots carry far more than either.
“No sulfites added” and the green USDA seal are real categories: a wine labeled organic may have no sulfites added at all, and one “made with organic grapes” may have up to 100 parts per million. Buy them for the farming if you like. Do not buy them for your head. A wine without sulfites spoils faster, and a spoiled wine is a worse evening than a headache.
The suspects
The alcohol. The dull answer and the most likely one. Alcohol is a known migraine trigger, the red-wine headache overlaps with migraine and seems to run in families, and a red at 14.5 percent poured into a large glass is a bigger dose than the white at 12.5 poured into a small one. Most red-wine headaches are a dose that arrived faster than it felt.
Histamine. Red wine carries more of it than white, and some people lack the enzyme that clears it. The link to headache is real for a few and unproven as the general cause; a 2025 review of the evidence calls histamine unlikely to be the main culprit and dismisses tyramine, the other old suspect, because wine carries too little of it to matter.
Quercetin. The newest and most interesting. In 2023 Andrew Waterhouse and colleagues at UC Davis proposed that quercetin, a compound grapes make in sunlight and reds carry in quantity, is converted in the body into a form that blocks the enzyme that clears acetaldehyde, the toxic step between alcohol and vinegar. Acetaldehyde is what makes a hangover feel like a hangover; let it pile up and you get the flushing, the nausea and the headache within an hour, not the next morning. The work was done in a test tube, and the authors say so: human testing is needed, and Waterhouse himself notes the effect is not direct; quercetin in an apple will not hurt you. But if it holds up, it explains the pattern better than anything else has: it takes alcohol plus a sun-ripened red, it hits fast, and the big, dark, expensive Cabernet grown in full California sun carries more of it than the pale Pinot from the fog.
What the science agrees on is humility. The same 2025 review pooled every decent study it could find and concluded there is no conclusive evidence that wine raises or lowers migraine risk at all. Everyone has a theory. Nobody has a trial.
The test
You can find your own answer in two evenings, and it costs less than a bottle of aspirin.
Evening one: a dry white, same glass, same pace, same food. If the headache comes anyway, it is the alcohol, and the fix is a smaller glass, a glass of water beside it and one pour an hour. Nothing on the label will help you.
Evening two: a light red from a cool place. Pinot Noir from Oregon or the Sonoma Coast, Beaujolais, Loire Cabernet Franc, a Rioja Crianza: lower alcohol, paler color, grapes that saw fog instead of full sun, which is to say less of everything on the suspect list. If that passes and the big Napa Cabernet does not, you have your answer, and it is a good one, because the light reds are cheaper. The $15 Beaujolais-Villages from No. 22 and the $15 Monterey Pinot from No. 19 are the two to run it with.
If neither passes, and the headaches are frequent or severe, that is a conversation for a doctor, not a sommelier. Migraine is a medical condition and wine is one trigger among many.
What to do at the shelf
Read the alcohol, remembering it may be understated by a point and a half, and reach for the lower number. Read the color through the glass; paler is less of everything. Skip the “no sulfites added” shelf unless you want the farming. And if you want to know which of the three reds in front of you was grown in fog and which in full sun, photograph the shelf and ask me. I know where every one of them was grown, and I will tell you which is the light one.
Straight answers
Do sulfites in wine cause headaches?
No evidence says so. Sulfites cause breathing reactions in about five percent of people with severe asthma; they are not a known headache trigger. White and sweet wines carry more sulfites than red, yet the “red-wine headache” spares them.
Why does red wine give me a headache but white does not?
Unproven, but the leading suspects are the alcohol dose, histamine for a minority, and quercetin, a compound in sun-ripened red grapes that a 2023 UC Davis study proposes blocks the body’s clearing of acetaldehyde. Human trials are still needed.
What is quercetin in wine?
A flavonol grapes make in sunlight, concentrated in dark red wines from sunny sites. Waterhouse, Levin and Devi (Scientific Reports, 2023) proposed its metabolite inhibits the ALDH2 enzyme, letting acetaldehyde build up and cause flushing and headache.
Does organic wine have sulfites?
USDA-certified organic wine may have no sulfites added (under 10 ppm naturally occurring). Wine “made with organic grapes” may contain up to 100 ppm. Neither category has been shown to prevent headaches.
Which red wine is least likely to cause a headache?
Lighter, paler reds from cool sites with lower alcohol: Pinot Noir, Beaujolais, Loire Cabernet Franc, Rioja Crianza. Drink with water and food, one glass an hour. See a doctor if headaches are frequent or severe.