What is E252?

Potassium nitrate is a chemical compound with a sharp, salty, bitter taste and the chemical formula KNO3. It is a potassium salt of nitric acid. E252 sits in the E200–E299 series, which in the EU classification mainly covers preservatives.

What is E252 used for?

E252 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 E252 safe?

E252 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 E252 appears on labels

On food packaging you'll find E252 either as the number “E252” or by the name “Potassium nitrate” 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 E252 vegan?

Yes, E252 is suitable for vegans.