What is E239?

Hexamethylenetetramine (HMTA), also known as 1,3,5,7-tetraazaadamantane, is a heterocyclic organic compound with diverse applications. It has the chemical formula (CH2)6N4 and is a white crystalline compound that is highly soluble in water and polar organic solvents. E239 sits in the E200–E299 series, which in the EU classification mainly covers preservatives.

What is E239 used for?

E239 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 E239 safe?

E239 is one of the additives Skaren flags as “avoid”. Releases formaldehyde. 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 E239 appears on labels

On food packaging you'll find E239 either as the number “E239” or by the name “Hexamethylene tetramine” 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 E239 vegan?

Yes, E239 is suitable for vegans.