Calcium aluminium silicate
Permitted in AU-NZ and EU and US. No evidence of harm at dietary intake.
- Category
- Anti-caking agents
- Vegan
- Yes
- Vegetarian
- Yes
What it is
A synthetic mineral compound used as an anti-caking agent to prevent powders from clumping.
How it is used in food
Keeps powders and salt free-flowing in humid conditions.
Commonly found in- None (Banned)
Health and safety
No known risks at typical dietary levels.
Authorised in the EU as an anti-caking agent. EFSA's tolerable weekly intake for aluminium is 1 mg/kg body weight, applied across all dietary sources.
Regulatory status
| Region | Status | Notes |
|---|---|---|
| Australia & New Zealand FSANZ |
Permitted | Permitted under the FSANZ Food Standards Code. |
| European Union EFSA / European Commission |
Permitted | Authorised for food use under EU regulations (Annex II). |
| United States FDA (Food and Drug Administration) |
Permitted | Authorised for food use by the FDA (often GRAS for standard additives). |
Identification on labels
- E-number
- E556
Also printed asCalcium aluminum silicate
Worth knowing
Being a silicate rather than a soluble salt makes it the least available of the aluminium-bearing additives — the same element in a much less absorbable form.
Conclusion
Best avoided to reduce unnecessary dietary aluminum exposure.
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Open the appEntry last reviewed 2026-08-05.
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