CodeE402 · INS 402
TypeThickener
Made fromBrown seaweed.
Found indesserts, sauces, dairy products, ice cream and soups
What is E402?
E402 is Potassium alginate, a thickener. Plant (algae).
Also written as: INS 402, E-402, E 402. 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 E402 halal?
E402 (Potassium alginate) is halal. Plant (algae).
What is E402 made from?
Brown seaweed.
What is E402 used for?
E402 is used as a thickener, typically in desserts, sauces, dairy products, ice cream and soups.
What should I do if a product contains E402?
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
E400Alginic acidE401Sodium alginateE404Calcium alginateE405Propylene glycol alginateE407CarrageenanE407aProcessed eucheuma seaweed
Last reviewed 2026-10-06. How we decide · Suggest a correction