Sulfites in Wine: The Most Misunderstood Ingredient
A preservative in almost all wine — not the cause of most headaches, not what makes wine “unnatural,” and now at the center of the low-intervention movement.
“Contains sulfites” appears on virtually every wine bottle sold worldwide. People with no allergy to sulfites blame them for headaches. People with actual sensitivities ignore them and drink anyway. The truth lies somewhere unexpected.
Sulfites — sulfur dioxide (SO₂) — are an antioxidant and antimicrobial agent added to most wine to keep it stable. They're not new (the Romans used them), they're not unique to wine (they're in dried apricots, deli meat, and your own metabolism), and they're not the cause of most “wine headaches.”
But the modern wine world is rethinking how much to use. Natural wine, low-intervention wine, sulfite-free wine — the trend is real, and Argentina is part of it.
The five chapters
01What Sulfites Actually Are
The chemistry, not the mystery.
Leer el capítulo 1 →Why Winemakers Use Them
Antioxidant and antimicrobial.
Leer el capítulo 2 →The Headache Myth
What actually causes “wine headaches.”
Leer el capítulo 3 →Natural & Low-Sulfite Wines
The modern low-intervention movement.
Leer el capítulo 4 →Argentina's Low-Intervention Scene
Productores worth knowing.
Leer el capítulo 5 →Respuestas rápidas
Are sulfites in wine bad for you?
For most people, no. About 1% of the population is genuinely sulfite-sensitive — almost all of them asthmatic. For everyone else, the amount of sulfites in wine (50–150 mg/L) is far less than in dried fruit, lunch meat, or many other foods. Sulfites are also produced naturally by your own body.
Do sulfites cause wine headaches?
Almost certainly not, for most people. Wine headaches are usually caused by dehydration, histamines (more in aged red wine), tyramine, biogenic amines in low-quality wine, or simple alcohol effects. If you suspect sulfites, try a low-sulfite wine. If headaches persist, look elsewhere.
Why does the label say “contains sulfites” if they're naturally occurring?
Because the labeling law requires disclosure if sulfite content is above 10 mg/L. Almost all wine — including “no sulfites added” — exceeds this because yeast naturally produces small amounts during fermentation. The label is a transparency requirement, not a warning.
What are natural wines, and are they better?
Natural wines are made with minimal intervention — native yeasts, no added enzymes, minimal or no sulfites. They're not “better” — they're different. Some are spectacular; some are flawed. They're often cloudier, more unpredictable, and need to be drunk young.
Do Argentine winemakers use a lot of sulfites?
Average amounts, similar to most wine regions. The country has a small but growing natural wine scene, with several producers making low-sulfite cuvées. Most mainstream Argentine wine uses standard sulfite levels (well below EU legal limits).