What is E228?

Potassium bisulfite (or potassium hydrogen sulfite) is a chemical mixture with the approximately correctly mentioned formula chemical formula KHSO3. Potassium bisulfite in fact is not an actual compound, but a mixture of salts that dissolve in water to give solutions composed of potassium ions and bisulfite ions. E228 sits in the E200–E299 series, which in the EU classification mainly covers preservatives.

What is E228 used for?

E228 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 E228 safe?

E228 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 E228 appears on labels

On food packaging you'll find E228 either as the number “E228” or by the name “Potassium 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 E228 vegan?

Yes, E228 is suitable for vegans.