The Real Benefits of Low-Sulfite Wine (and the Headache Myth)
Sulfites get blamed for a lot. Headaches. Stuffy noses. That rough morning after a party. So it's no surprise that "low-sulfite wine" sounds like the fix.
Here's the truth: low-sulfite wine really does help some people, but not always the ones who think they need it. Let's sort it out.
What are the benefits of low-sulfite wine?
Low-sulfite wine helps people who are truly sensitive to sulfites, and most of them have asthma. Less sulfur dioxide can mean fewer reactions, like wheezing, a tight chest, or hives. For everyone else, the research doesn't show a real difference.
That's the short answer. Now for the fun part.
What are sulfites, anyway?
Sulfites are preservatives, and winemakers have used them for centuries to keep wine from spoiling and to protect its color and flavor. As Cleveland Clinic's guide to sulfite sensitivity points out, they also show up in foods like dried fruit. On a label, you'll often see them listed as sulfur dioxide or potassium metabisulfite.
Quick myth check: sulfites are not sulfates, the stuff in your shampoo, and they're not sulfa drugs either. Totally different things.
Yeast even makes a little sulfite on its own while wine ferments, and federal wine labeling rules don't let any bottle claim to be "sulfite free."
How much sulfite is in a glass of wine?
Probably less than you think. The UC Davis wine chemists who looked into why red wine causes headaches say a glass holds about 20 milligrams. Your body makes around 700 milligrams a day on its own, just from breaking down protein.
Here's a fun comparison. Bright orange dried apricots can pack about 2,000 milligrams per kilogram, according to the Waterhouse Lab at UC Davis. That's about 112 milligrams in a two-ounce snack, or more than five glasses of wine's worth.
"Low sulfite" isn't an official label term in the U.S. These are the numbers that do count, straight from the TTB's sulfite labeling rules, its organic wine guide, and its lab testing method:
Sulfite level | What it means for a U.S. wine |
Under 10 ppm | No sulfite warning needed. A bottle can say "contains less than 10 ppm sulfites" only after TTB lab testing. |
10 ppm or more | "Contains Sulfites" must be on the label. |
Under 100 ppm | The limit for wine "made with organic grapes." |
350 ppm | The legal ceiling. |
Bottom line: "Contains Sulfites" is a yes-or-no warning, and it won't tell you whether the wine sits at 15 ppm or 300.
Who actually benefits from low-sulfite wine?
Sulfite sensitivity shows up most in people with asthma. About 4 to 5 percent of them have some form of it, and asthma is the single biggest risk factor for a reaction. People without asthma can react too, but serious reactions are very rare.
Notice wheezing, a stuffy nose, or hives after other sulfite-heavy foods, like dried fruit? That's worth a chat with your doctor.
Now for the most interesting research. In a 2001 study published in Thorax, researchers tested 24 adults who were sure wine set off their asthma. Only 4 of them reacted to the sulfites, and only to wine containing 300 ppm. At 20, 75, and 150 ppm? No reaction.
It's a small study, so it's not the final word, but it still tells us two things. For truly sensitive people, the amount matters, and the amount is exactly what low-sulfite wine changes. And most people in the study who blamed wine weren't reacting to the sulfites at all.
Does low-sulfite wine stop wine headaches?
Probably not, and this is where the sulfite myth really runs wild.
The UC Davis team says there's little evidence that sulfites cause headaches. White wine has about the same sulfites as red, yet red is the one that usually gets the blame.
Their 2023 red wine headache study points to a new suspect: quercetin, a natural compound in grape skins that builds up as the grapes soak in sunlight. In lab tests, it slowed down the enzyme your body uses to clear acetaldehyde, a toxic byproduct of alcohol. When acetaldehyde builds up, it's linked to flushing, headaches, and nausea. The team is clear that the idea still needs testing in people.
So if red wine gives you a headache but white doesn't, a low-sulfite bottle may not be your fix.
How do you shop for lower-sulfite wine?
Treat "Contains Sulfites" as a yes, not a number. It only means the wine hit 10 ppm.
Learn the organic labels. "Organic" wine can't have added sulfites. Wine "made with organic grapes" can have up to 100 ppm.
Ask the winery. Many wineries track their sulfite levels and will tell you if you ask.
Had a serious reaction? See an allergist first. There's no reliable blood or skin test for sulfite sensitivity. Doctors usually go by your history and a supervised food challenge test.
Do Island Grove wines contain sulfites?
Yes, and we're glad you asked. We keep our sulfites extremely low, watch them closely, and stay well below standard limits. Our wines are also vegan and gluten free. You'll find those answers and a few more on our winery FAQ page.
Our Blue Roots wines start right in our own Florida blueberry fields, where we farm 400 acres of southern highbush blueberries.
If you think fruit wine has to be sweet, try the Kinda Dry Blueberry. It's 100% blueberry with no grape juice, fermented on the skins for up to 30 days in small batches. If you want something softer, the Sorta Sweet Blueberry is also 100% blueberry, lighter-bodied, and best served chilled. See the whole lineup in our Blue Roots Collection.
Got a question about sulfites or allergies before you pour? Send us a note and we'll help. Cheers.
Low-Sulfite Wine FAQ
Is low-sulfite wine healthier?
For most people, there's no evidence it makes a meaningful difference. The real benefit is for people with sulfite sensitivity, who mostly have asthma.
Is any wine totally sulfite-free?
No. Yeast makes a little sulfite while wine ferments, and U.S. rules don't allow a "sulfite free" label. The lowest claim allowed is "contains less than 10 ppm sulfites," and it takes TTB lab testing.
What does "Contains Sulfites" mean on a wine label?
It means the wine has 10 parts per million or more of sulfur dioxide. It doesn't tell you how much more.
Do sulfites cause wine headaches?
For most people, there's little evidence they do. UC Davis researchers point to quercetin, a compound in red grape skins, as a more likely cause. It still needs testing in people.
Do Island Grove wines contain sulfites?
Yes. Island Grove wines have extremely low sulfite levels, which we monitor closely and keep well below standard limits. Our wines are also vegan and gluten free.
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