What is E621?
E621 is Monosodium glutamate (MSG), a flavour enhancer. Microbial.
Also written as: INS 621, E-621, E 621, monosodium glutamate, msg. 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.
Frequently asked questions
Is E621 halal?
E621 (Monosodium glutamate (MSG)) is halal. Microbial.
What is E621 made from?
Fermentation of starch or sugar.
What is E621 used for?
E621 is used as a flavour enhancer, typically in crisps, instant noodles, stock cubes and ready meals.
What should I do if a product contains E621?
No action needed for this additive. Check the rest of the ingredient list, and remember that meat products still need proper halal slaughter.
Related E-numbers
Last reviewed 2026-10-06. How we decide · Suggest a correction