What is E249?

Potassium nitrite (distinct from potassium nitrate) is the inorganic compound with the chemical formula KNO2. It is an ionic salt of potassium ions K+ and nitrite ions NO2−, which forms a white or slightly yellow, hygroscopic crystalline powder that is soluble in water. E249 sits in the E200–E299 series, which in the EU classification mainly covers preservatives.

What is E249 used for?

E249 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 E249 safe?

E249 is one of the additives Skaren flags as “avoid”. Many people choose to limit their intake of it. “Avoid” means it is linked to health concerns, requires a warning label, or is banned in some countries.

How E249 appears on labels

On food packaging you'll find E249 either as the number “E249” or by the name “Potassium nitrite” 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 E249 vegan?

Yes, E249 is suitable for vegans.