This article includes health-related information that may change over time and is not intended as medical advice — always consult your physician before making health decisions.
We’ve all seen that conspicuous warning on wine labels: “Contains Sulfites.” It sounds ominous, almost like a health alert, and sulfur dioxide (SO₂) has become one of the most misunderstood and controversial ingredients in wine. You’ve probably heard someone blame sulfites for headaches or hangovers, or dismiss them as proof of “unnatural manipulation” in winemaking.
Before we dive into the myths, it helps to understand why that warning exists in the first place. The short answer: regulation, not danger.
The requirement traces back to the late 1980s, when sulfites became a political target during a broader push for stricter food and drug labeling. A group of neo-abolitionists successfully lobbied Senator Strom Thurmond, an outspoken teetotaler who famously railed against anything he felt encouraged alcohol consumption. At one point, he even took to the Senate floor to denounce Spuds MacKenzie, the Bud Light mascot, which he viewed as a reckless “party animal” corrupting America’s youth.
Not long after, Thurmond helped push sulfite disclosure into federal law as part of the 1988 Anti-Drug Abuse Act. The result was a mandate requiring any wine with more than 10 parts per million of detectable sulfites to carry the now-infamous “Contains Sulfites” statement.
So that scary little line on the label isn’t there because wine is dangerous or artificially engineered. It’s there because lawmakers said it had to be.
Why Add Sulfur to Wine?
First things first: sulfur is a natural byproduct of fermentation. That means every wine on the planet contains at least a trace amount of sulfites, even bottles labeled “sulfite free.” So the real question isn’t why is sulfur in wine, but why do winemakers add more of it?
The answer comes down to protection. Sulfur dioxide plays two critical roles in keeping wine stable and delicious.
As an antioxidant, sulfur binds with oxygen in the wine, limiting oxidation and making it harder for unwanted microorganisms to survive. As an antiseptic, it suppresses undesirable yeasts and bacteria, helping preserve freshness and preventing off flavors from taking over.
The small amount of sulfur created naturally during fermentation might keep a wine intact for a short time, maybe weeks or a couple of months. After that, things can go sideways fast. Volatile acidity, brettanomyces, and mousiness are just a few of the gremlins that can show up. Adding sulfur dramatically reduces the risk of spoilage and helps ensure the wine tastes the way the winemaker intended when you finally open the bottle.
How Much Sulfur is in Wine?
There’s no single number, but most wines fall into a pretty reasonable range. In general, you’ll see somewhere between 100 and 200 parts per million.
Dry reds usually sit around 150 ppm. Dry whites and rosés tend to be closer to 200 ppm. Sweet reds fall in that same neighborhood, while sweet whites and rosés can push up to about 250 ppm. Some specialty wines, like botrytized wines such as Sauternes, can reach up to 300 ppm.
For context, many everyday foods contain far more sulfites than wine.
Three Common Myths About Sulfites:
Organic wines don’t contain sulfites.
Not quite. Organic and natural wines may avoid added sulfites, but because sulfur is a natural byproduct of yeast metabolism, even these wines usually contain a small amount, often around 5 to 10 ppm.
Red wine has higher sulfite levels.
It’s actually the opposite. White wines generally contain more sulfites than reds. Red wines benefit from tannins, which act as natural stabilizers and reduce the need for added sulfur.
Sulfites cause headaches and hangovers.
This is the big one. Fewer than 1 percent of Americans have a true sulfite allergy. That’s about two tenths of one percent. Statistically speaking, sulfites are very unlikely to be the culprit. A 2008 study in The Journal of Headache and Pain found that even in people with asthmatic sulfite sensitivity, sulfites were not shown to cause headaches. The study also pointed out that foods like dried fruit, chips, raisins, soy sauce, pickles, and fruit juice can contain sulfite levels many times higher than wine. Yet no one seems to blame Raisin Bran for their migraine.
The Final Word
If you’re still determined to eliminate sulfites from your wine, there are gadgets and additives out there that claim to filter them out. Otherwise, unless you’re one of the very rare folks with a legitimate sulfite allergy, this is probably not something worth losing sleep over.
In other words, relax. Open the bottle. Enjoy the wine.
