What is E343?

Trimagnesium phosphate describes inorganic compounds with formula Mg3(PO4)2·nH2O. They are magnesium acid salts of phosphoric acid, with varying amounts of water of crystallization: n = 0, 5, 8, 22. E343 sits in the E300–E399 series, which in the EU classification mainly covers antioxidants and acidity regulators.

What is E343 used for?

E343 belongs to the antioxidants group. Antioxidants stop fats going rancid and food discolouring. Several are natural, such as ascorbic acid (vitamin C).

Is E343 safe?

E343 is considered safe at the levels used in food and is approved for use in the EU. “Safe” means it is approved in the EU and regarded as safe at the levels used in food.

How E343 appears on labels

On food packaging you'll find E343 either as the number “E343” or by the name “Magnesium phosphates” 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 E343 vegan?

Yes, E343 is suitable for vegans.