What is E251?

Sodium nitrate is the chemical compound with the formula NaNO3. This alkali metal nitrate salt is also known as Chile saltpeter (large deposits of which were historically mined in Chile) to distinguish it from ordinary saltpeter, potassium nitrate. E251 sits in the E200–E299 series, which in the EU classification mainly covers preservatives.

What is E251 used for?

E251 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 E251 safe?

E251 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 E251 appears on labels

On food packaging you'll find E251 either as the number “E251” or by the name “Sodium 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 E251 vegan?

Yes, E251 is suitable for vegans.