What are sulphites in wine, and are they dangerous?


What are sulphites in wine?

Sulphites in wine are chemical compounds (sulphur dioxide, or SO2) that occur naturally, to a varying degree, in all types of wine. Because sulphites act as both a wine’s preservative and enhancer, many vintners purposely add sulphites at key moments of the winemaking process to quickly halt on-going fermentation or to help protect the wine against potential oxidation or bacterial exposure which could occur at various stages of the winemaking process.

All wines contain sulphites at around 10 milligrams per litre. NB: Commercially-made wines contain from ten to twenty times that amount. Wine sulphites are highest in Sweet wines, they have the biggest doses because sugar combines with and binds a high proportion of any SO2 that is added. White wines and Rosés don’t tend to contain natural anti-oxidants because they do not tend to be left in contact with their skins after crushing. For this reason, they are more prone to oxidation and tend to be given larger doses of sulphur dioxide. Sulphites are lowest in dry – Red wines which do not usually need added sulphur dioxide because they naturally contain anti-oxidants, acquired from their skins and stems during fermentation.

Are sulphites dangerous?

The biggest health risk involving sulphites would be an allergic reaction. While it’s listed as a food allergen, a true allergic reaction in the form of anaphylaxis is, in fact, a very rare phenomenon. Some people get headaches only from red wine and some get them just from, say, a very cheap Chilean wine. It has to do with histamines and all sorts of other complex science. It really is best to talk with your doctor about this.

Do sulphites in wine cause headaches?

While sulphites can cause asthmatic symptoms, they do not cause headaches. Watch out for the tannins though!! Tannins are naturally occurring compounds that exist inside grape skins, seeds and stems. Also, make sure you drink your daily water intake, this helps a lot!

How to tell how much sulphur a wine contains?

Under strict EU law, vineyards must have the levels of sulphur dioxide present on the label. Organic and biodynamic organisations, such as Demeter, often impose their own restrictions on the wine that carries their labels. A good natural wine, for example, will have levels less than half those imposed by the strictest organic organisations.

For those of you that think you might be sensitive to sulphites, may I suggest that you first go for a chat with your GP, and secondly take a look at trying some of our Natural Wine.

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