What is E336?

Potassium tartrate, dipotassium tartrate or argol has formula K2C4H4O6. It is the potassium salt of tartaric acid. E336 sits in the E300–E399 series, which in the EU classification mainly covers antioxidants and acidity regulators.

What is E336 used for?

E336 belongs to the antioxidants group. Antioxidants stop fats going rancid and food discolouring. Several are natural, such as ascorbic acid (vitamin C).

Is E336 safe?

E336 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 E336 appears on labels

On food packaging you'll find E336 either as the number “E336” or by the name “Potassium tartrates” 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 E336 vegan?

Yes, E336 is suitable for vegans.