Is E551 (Silicon dioxide) Halal?
Generally halal
E551 (Silicon dioxide / silica) is a mineral anti-caking agent with no animal origin, so it is generally considered halal.
What is E551?
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.
Why is it generally halal?
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.
Commonly found in
It may be found in — this does not mean every product below contains it.
- Powdered and instant foods
- Seasonings and spice blends
- Supplements and tablets
- Coffee whiteners and salt
How it appears on labels
Silicon dioxideSilicaE551Anti-caking agent (E551)INS number: 551
How to verify a product in Singapore
- Ingredient-level guidance is not halal certification — check the complete product, not just this ingredient.
- Look for recognised halal certification, and check the finished product on the official MUIS HalalSG register.
- When the source or processing aids are unclear, contact the manufacturer.
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.
Frequently asked questions
Is E551 (silicon dioxide) halal?
Yes — it is a mineral (silica) with no animal origin, so it is generally considered halal. The finished product still needs verification.
Is silicon dioxide from animals?
No. It is a mineral (or synthesised silica).
What names should I look for?
'Silicon dioxide', 'Silica' or 'E551'.
Sources & methodology
- Re-evaluation of silicon dioxide (E 551) as a food additive — European Food Safety Authority (EFSA) · Mineral (silica) origin
- General Standard for Food Additives (GSFA) Online Database — Codex Alimentarius (FAO/WHO) · Approved uses and INS number
- Halal Certification — HalalSG — Majlis Ugama Islam Singapura (MUIS) · Singapore halal verification process
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.