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Silicon Dioxide
Silicon Dioxide
Also known as: E551, Silica, SiO2
Low concern
EFSA's 2024 re-evaluation concluded E551 does not raise safety concerns at reported uses (margins of exposure all above 36) and is not genotoxic, including for nano-aggregates. Recommended lowering maximum limits for lead, mercury, and arsenic in specifications.
Found in
16,493 products
E-number
E551
Type
carrier
What it is
Silicon dioxide (silica, E551) is a synthetic amorphous silica.
Anti-caking agent in powdered foods.
Why it's flagged
- Nano-particle considerations evaluated and found acceptable
- Recommended tightening of heavy-metal specifications
What regulators actually say
"The Panel concluded that E 551 does not raise a safety concern in all population groups at the reported uses and use levels."
"Silicon dioxide ... may be safely used in food."
Regulatory status
United States — FDA
GRAS (21 CFR 172.480)
European Union — EFSA
Authorised (re-evaluated 2024)
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