CodeE551 · INS 551
TypeAnti-caking agent
Made fromMineral (silica).
Found insalt, powdered drinks, spices, supplements and tablets
What is E551?
E551 is Silicon dioxide, an anti-caking agent. Mineral.
Also written as: INS 551, E-551, E 551. 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 E551 halal?
E551 (Silicon dioxide) is halal. Mineral.
What is E551 made from?
Mineral (silica).
What is E551 used for?
E551 is used as an anti-caking agent, typically in salt, powdered drinks, spices, supplements and tablets.
What should I do if a product contains E551?
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
E504Magnesium carbonatesE542Bone phosphateE552Calcium silicateE553bTalcE554Sodium aluminium silicateE570Stearic acid (fatty acids)
Last reviewed 2026-10-06. How we decide · Suggest a correction