Sulphur dioxide
What is Sulphur dioxide?
Sulphur dioxide (SO2) is a gas that occurs naturally in small amounts in volcanic gases and is produced during the combustion of sulphur-containing materials. Industrially, it is often produced by burning sulphur or by roasting sulphide ores. It is commonly used in its pure form or as salts like sodium or potassium metabisulphite.
Is Sulphur dioxide vegan?
Sulphur dioxide is not animal-derived. Products that contain it can still include other animal-derived ingredients, so check the full ingredient list.
Is Sulphur dioxide a major allergen?
Sulphur dioxide and sulphites are listed as one of the 14 major allergens that must be declared on food labels if present at concentrations above 10 mg/kg or 10 mg/litre.
What is Sulphur dioxide used for?
Sulphur dioxide and related compounds are widely used as preservatives and antioxidants in food.
Is Sulphur dioxide safe?
Sulphur dioxide is an authorised food additive in the UK and EU, listed on the Register of Food Additive Authorisations.
Why it's used
Sulphur dioxide and related compounds are widely used as preservatives and antioxidants in food. They prevent the growth of bacteria, yeasts and moulds, and stop foods from browning or changing colour. They are particularly effective in dried fruits, wines, and some processed meats and vegetables.
Health notes
Sulphur dioxide is an authorised food additive in the UK and EU, listed on the Register of Food Additive Authorisations. It is evaluated by EFSA, which has assessed its safety. Some individuals, particularly those with asthma, may be sensitive to sulphites, which can trigger symptoms like wheezing or shortness of breath. However, for the general population, when consumed within permitted levels, it is considered safe.
Regulatory status
Authorised in Great Britain (FSA register): England, Scotland, Wales. FSA register of authorised products
Allergen info
Sulphur dioxide and sulphites are listed as one of the 14 major allergens that must be declared on food labels if present at concentrations above 10 mg/kg or 10 mg/litre. They are not derived from any other of the listed allergens.
Foods that contain Sulphur dioxide
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