What is E221?

Sodium sulfite (sodium sulphite) is the inorganic compound with the chemical formula Na2SO3. A white, water-soluble solid, it is used commercially as an antioxidant and preservative. E221 sits in the E200–E299 series, which in the EU classification mainly covers preservatives.

What is E221 used for?

E221 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 E221 safe?

E221 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 E221 appears on labels

On food packaging you'll find E221 either as the number “E221” or by the name “Sodium 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 E221 vegan?

Yes, E221 is suitable for vegans.