What is E623?
E623 is Calcium diglutamate, a food additive used as a flavour enhancer. Fermentation-based, like MSG.
Also written as: INS 623, E-623, E 623. 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 E623 vegetarian or vegan?
Yes. E623 (Calcium diglutamate) 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 Fermentation-based, like MSG.
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 E623 halal?
E623 (Calcium diglutamate) is halal. Fermentation-based, like MSG.
What is E623 made from?
Glutamic acid made by fermentation.
What is E623 used for?
E623 is used as a flavour enhancer, typically in crisps, instant noodles, stock cubes and ready meals.
What should I do if a product contains E623?
No action needed for this additive. Check the rest of the ingredient list, and remember that meat products still need proper halal slaughter.
Is E623 vegetarian or vegan?
Yes. E623 (Calcium diglutamate) is normally made from plant, mineral, microbial or synthetic sources, so it is suitable for vegetarians and vegans.