What is E529?
E529 is Calcium oxide, a food additive used as a flour treatment agent. Mineral (quicklime).
Also written as: INS 529, E-529, E 529. INS is the international numbering system used outside Europe, including on labels in Asia, Australia and the Middle East.
What to do
No action needed for this additive. Check the rest of the ingredient list, and remember that meat products still need proper halal slaughter.
Is E529 vegetarian or vegan?
Yes. E529 (Calcium oxide) is normally made from plant, mineral, microbial or synthetic sources, so it is suitable for vegetarians and vegans.
Why we classify it this way
Halal Mineral (quicklime).
Basis: No concern found. Made from plants, minerals, fermentation or synthesis, or from a permitted animal product. Nothing in normal production raises a pork, alcohol, insect or slaughter question.
No external reference is listed for this record yet.
Classification audited 3 November 2026. It has not been reviewed by a scholar. How classifications work · Suggest a correction
Frequently asked questions
Is E529 halal?
E529 (Calcium oxide) is halal. Mineral (quicklime).
What is E529 made from?
Mineral salt.
What is E529 used for?
E529 is used as a flour treatment agent, typically in bread, rolls and bakery products.
What should I do if a product contains E529?
No action needed for this additive. Check the rest of the ingredient list, and remember that meat products still need proper halal slaughter.
Is E529 vegetarian or vegan?
Yes. E529 (Calcium oxide) is normally made from plant, mineral, microbial or synthetic sources, so it is suitable for vegetarians and vegans.