Sulphites in Wine: The Essential Truth Every Wine Lover Needs to Know

Sulphites in wine might be the most misunderstood thing on any bottle label. That little phrase — contains sulphites — has sent more people spiralling into unnecessary panic than almost anything else in the drinks world. Are they dangerous? Are they why your head pounds after a Friday night Malbec? Should you be hunting down sulphite-free wine with the urgency of a truffle hound?

Short answer: almost certainly not. Long answer: pull up a chair.

What Are Sulphites, Exactly?

So, what are sulphites? Sulphites (also written as sulfites, particularly in American English — same thing, different spelling) are chemical compounds that contain sulphur dioxide (SO₂). They occur naturally during the fermentation process, which means every single bottle of wine on the planet contains some sulphites, whether the winemaker adds any or not.

Yeast, doing what yeast does brilliantly during fermentation, naturally produces small amounts of sulphur dioxide as a by-product. According to Wine Folly, even so-called “no added sulphites” wines typically contain between 10 and 40 parts per million (ppm) of naturally occurring sulphites. For context, the legal maximum in the EU for a dry red wine is 150 ppm. Sweet wines can go up to 400 ppm.

Why Do Winemakers Add Sulphites to Wine?

This is where sulphites in wine shift from a curiosity to an absolute cornerstone of winemaking. Sulphur dioxide has been used in winemaking for centuries — the Romans reportedly burned sulphur candles inside wine vessels to preserve them — and there are two very good reasons it has stuck around.

First, it’s an antioxidant. Oxygen is wine’s great enemy once the bottle is open. Sulphites mop up oxygen and prevent oxidation, which is what turns a fresh, vibrant Sauvignon Blanc into something that smells vaguely of nail varnish remover.

Second, it’s an antimicrobial agent. Sulphites suppress unwanted bacteria and wild yeasts that could spoil the wine or send the fermentation in the wrong direction entirely. Without some level of sulphur dioxide, even the finest bottle from Bordeaux or Burgundy would struggle to survive its journey from winery to your glass.

Decanter explains that sulphites essentially act as a preservative that keeps wine shelf-stable and true to what the winemaker intended. Remove them entirely and you’re on a very tight timeline before things go sideways.

What Are Sulfites in Wine Doing to Your Body?

Here is where we need to separate myth from fact with a reasonably firm hand. What are sulfites in wine actually doing when you drink them? For the vast majority of people — nothing noteworthy at all.

The idea that sulphites cause wine headaches is, frankly, one of the great wine myths. Red wine headaches are far more likely caused by histamines, tannins, or simply drinking a bit too enthusiastically without enough water. White wine and rosé often contain HIGHER levels of sulphites than reds, yet you rarely hear people blaming their Pinot Grigio for a pounding head.

That said, genuine sulphite sensitivity does exist — it is just far rarer than the sulphite discourse would have you believe. The NHS estimates that sulphite sensitivity affects roughly 1% of the general population, and it is particularly associated with people who also have asthma. Reactions can include wheezing, rashes, or stomach upset. If you suspect a genuine sensitivity, speaking with your GP is always the sensible move.

For everyone else? The sulphites in wine are not the villain.

Which Wines Have the Most (and Fewest) Sulphites?

A few useful rules of thumb:

Sweeter wines contain more sulphites. Sugar accelerates microbial activity, so winemakers need more SO₂ to keep the wine stable. A luscious Sauternes or a late-harvest Riesling will typically have significantly higher sulphite levels than a bone-dry red.

White and rosé wines tend to contain more sulphites than reds. Reds have naturally higher levels of tannins and anthocyanins, which provide some antioxidant protection of their own — meaning the winemaker can lean less heavily on sulphur dioxide.

Organic and biodynamic wines often use lower sulphite levels — though they are rarely truly sulphite-free. The EU permits organic wines to contain up to 100 ppm (compared to 150 ppm for conventional dry reds), so the difference exists but is not enormous.

If you are genuinely keen to explore lower-sulphite options, our Winedrops Wine Subscription is a brilliant place to start, featuring wines from producers who take a thoughtful, minimal-intervention approach in the cellar.

The Label Law: Why Every Bottle Says “Contains Sulphites”

Since 2005, EU law has required any wine containing more than 10 ppm of sulphites to carry the warning contains sulphites (or contains sulfites) on the label. Given that almost every wine exceeds this threshold naturally, the warning appears on virtually every bottle.

This has had the unintended effect of making something perfectly routine sound alarming. You will find the same mandatory disclosure on dried fruits, processed meats, and many ready meals — foods that often contain FAR higher levels of sulphites than a glass of Côtes du Rhône. A standard portion of dried apricots, for instance, can contain up to ten times the sulphites of a glass of wine.

The label is a legal requirement, not a health warning. Keep that firmly in mind next time it catches your eye.

Should You Be Worried About Sulphites in Wine?

Unless you have a confirmed sulphite sensitivity or asthma that reacts to SO₂, the answer is a resounding no. Sulphites in wine are present at levels that are safe, well-regulated, and — more to the point — essential to the wine arriving in your glass tasting as it should.

If you want to explore the world of naturally produced, lower-intervention wines with minimal added sulphites, the natural wine movement has produced some genuinely thrilling bottles in recent years. But do not write off conventional wine on sulphite grounds alone. That would be, to put it plainly, a tremendous waste of good drinking.

At Winedrops, we spend an enormous amount of time finding wines that are brilliant on every level — from how they are made to how they taste in your glass. If you want great bottles delivered to your door, with none of the faff, our Winedrops Monthly Wine Subscription has you more than sorted. You might even find a few low-sulphite gems along the way.

Cheers to drinking well — and worrying considerably less.