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E535Anti-caking agentModerate concern
Sodium Ferrocyanide
In plain words
The short version
An anti-caking agent in table salt — the cyanide is locked in an iron complex, but the name causes regular confusion.
Why we flag it amber
It's permitted and generally considered safe, but there are a few reasons to be mindful — like sensitivities in some people, debated studies, or intake limits. The Safety section below explains the specifics.
Safety profile
ADI of 0.025 mg/kg body weight expressed as ferrocyanide (JECFA). The iron-cyanide complex is one of the most stable known and does not release free cyanide in the digestive tract. The toxicological concern is the complex itself, not cyanide release. Russia banned it in 2018 over uncertainty about long-term iron-cyanide accumulation.
The detail
Educational information only. Not medical or dietary advice.