What does Sulphites mean?

Sulphites are sulphur compounds that protect wine from oxidation and bacteria; in the EU the label must say ‘contains sulphites’ above 10 mg/l.

Also known as: Sulphur, Sulphur dioxide, Contains sulphites

Sulphites are sulphur compounds, mainly sulphur dioxide (SO₂), used in winemaking to protect the wine from oxygen and unwanted microorganisms. Without protection a wine risks oxidising, turning brown and losing fruit, or being taken over by bacteria.

Some sulphites form naturally as yeast ferments, so even wine with no added sulphur usually contains small amounts. Most producers also add sulphur at some stage, for example at harvest, after fermentation or before bottling. How much is needed depends on the wine's pH, residual sugar and how clean the fruit is, among other things.

The EU sets maximum levels for total sulphur dioxide: 150 mg/l for dry red wine and 200 mg/l for dry white and rosé, with higher limits for sweet wines. Organic wine has lower limits. If the level is above 10 mg/l, the label must state ‘contains sulphites’, which is why the phrase appears on almost every wine.

On the wine page this field shows whether the wine carries the ‘contains sulphites’ labelling. It is a legal allergen statement and says nothing about the quality of the wine.