What is E222?

Sodium bisulfite (or sodium bisulphite, sodium hydrogen sulfite) is a chemical mixture with the approximate chemical formula NaHSO3. Sodium bisulfite is not a real compound, but a mixture of salts that dissolve in water to give solutions composed of sodium and bisulfite ions. E222 sits in the E200–E299 series, which in the EU classification mainly covers preservatives.

What is E222 used for?

E222 belongs to the preservatives group. Preservatives stop food from spoiling by slowing bacteria, mould and yeast. Most are safe, though some people limit certain ones.

Is E222 safe?

E222 is rated “moderate”. It is approved for use in food, but some people prefer to limit it. “Moderate” means it is approved, but is debated or something some people prefer to limit.

How E222 appears on labels

On food packaging you'll find E222 either as the number “E222” or by the name “Sodium hydrogen sulphite” in the ingredient list, often after its function. Ingredients are listed in descending order by weight, so an additive near the end is present only in small amounts.

Is E222 vegan?

Yes, E222 is suitable for vegans.