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E224CautionGroup: Preservatives
It is the potassium counterpart of E223, releasing sulphur dioxide in food to protect it from spoilage. You meet it mainly in wine, beer, fruit products and dried fruit.
Where you find it: wine, dried fruit, fruit juices, potato products
Limit it; people with asthma or sulphite sensitivity should check allergen labelling and avoid it.
Potassium metabisulphite (K2S2O5) is used in winemaking and brewing to release SO2, which suppresses unwanted microorganisms and oxidation. EFSA re-evaluated sulphites (E220–E228) in 2022 and, owing to toxicity data gaps, could not confirm an ADI; it did not rule out a safety concern for high consumers. In the EU, sulphites above 10 mg/kg or 10 mg/l (as SO2) must be labelled as an allergen.
E211Sodium benzoateE249Potassium nitriteE250Sodium nitriteE210Benzoic acidE220Sulphur dioxideE223Sodium metabisulphiteE251Sodium nitrateE252Potassium nitrateThis information is educational and based on EFSA assessments and available studies; it does not replace medical advice. With allergies, intolerances or illness, follow your doctor’s advice.
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