What is E529?

Calcium oxide, commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. E529 sits in the E500–E599 series, which in the EU classification mainly covers acidity regulators and anti-caking agents.

What is E529 used for?

E529 belongs to the acids & acidity regulators group. Acids and acidity regulators adjust taste and shelf life, such as citric acid (E330).

Is E529 safe?

E529 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 E529 appears on labels

On food packaging you'll find E529 either as the number “E529” or by the name “Calcium oxide” 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 E529 vegan?

Yes, E529 is suitable for vegans.