Authority source
Safety basis: FDA / EFSA
FDA assessment and EFSA opinion
Silicon Dioxide
SilicaE551
Anti-caking agent
Silicon dioxide is a natural mineral found in sand and rocks. It is used in many products to prevent powders from clumping together or to make liquids thicker.
What it is
Silicon dioxide is a naturally occurring mineral that functions as an anti-caking agent, thickener, and abrasive in various products.
Found in
food products (e.g., spices, powdered drinks), cosmetics (e.g., makeup, toothpaste), supplements, pharmaceuticals
The concern
No significant concerns identified when used in regulated amounts.
Legal status
It is approved for use as a food additive and cosmetic ingredient by regulatory bodies like the FDA and EFSA.
Low Concern
It is generally recognized as safe (GRAS) by regulatory bodies for its approved uses.
Evidence & sources
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Article / explainer
Article / explainer
No highly relevant article explainer found yet.
Video explainer
Video explainer
No highly relevant video explainer found yet.
Community questions
Community questions
Community discussions are not used as safety evidence and no highly relevant discussion is shown for this ingredient.
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Last updated: July 6, 2026