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Generally halal
E551 (Silicon dioxide / silica) is a mineral anti-caking agent with no animal origin, so it is generally considered halal.
Silicon dioxide, or silica, is a mineral used as an anti-caking agent to keep powders free-flowing and dry. It is common in powdered foods, seasonings and supplements.
Produced from mineral silica (or synthesised as fumed/precipitated silica) to food grade. No animal-derived material.
Silicon dioxide is a mineral with no animal or alcohol component, so it is generally classified as halal. As always, the finished product still needs its own verification.
It may be found in — this does not mean every product below contains it.
Silicon dioxideSilicaE551Anti-caking agent (E551)INS number: 551
Ingredient guidance is not certification. Verify the finished product on the MUIS HalalSG register or with the manufacturer.
Check MUIS HalalSGSources: EFSA, FAO/WHO, MUIS · Last reviewed: July 2026 · This guidance is not certification.
Yes — it is a mineral (silica) with no animal origin, so it is generally considered halal. The finished product still needs verification.
No. It is a mineral (or synthesised silica).
'Silicon dioxide', 'Silica' or 'E551'.
Humble Halal methodology: we classify additives by their common origin, not by any specific product. A generally-halal ingredient does not make a finished product halal-certified. This page is general guidance, not certification or religious/legal advice — always verify the complete product. Last reviewed July 2026.