Potassium ferrocyanide
Anti-caking agent in salt.
- Vegan
- Yes
- Vegetarian
- Yes
What it is
A highly effective anti-caking agent used specifically in table salt.
How it is used in food
Prevents table salt from clumping together into a solid block, ensuring it flows freely even in humid environments.
Commonly found in- Table salt
- Sea salt
- Road salt
Health and safety
Safe at regulated levels. Despite the scary "cyanide" name, the cyanide molecules are so tightly bound to the iron atom that they cannot be released or absorbed by the human body.
Evaluated by EFSA and confirmed safe for use in food at authorized levels.
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
- E536
Worth knowing
The chemical bond between the iron and cyanide is incredibly strong — even stomach acid cannot break it to release toxic cyanide.
Conclusion
Potassium ferrocyanide is a limited concern that is safe within regulated dietary amounts. Although the name mentions cyanide, the molecules are chemically locked to iron atoms and cannot be absorbed or set free in your body. EFSA has confirmed it is safe for keeping table salt free-flowing.
References
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Open the appEntry last reviewed 2026-07-28.
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