Potassium ferrocyanide is safe for consumption despite being structurally close to potassium cyanide
Although potassium ferrocyanide contains a cyanide group in its chemical structure, toxicological evaluations confirm that it is safe for consumption and does not release free cyanide, owing to the strong coordination of the iron-cyanide complex.
The claim states that potassium ferrocyanide is safe for consumption despite structural similarities to potassium cyanide. Papers [1] and [4] directly evaluate potassium ferrocyanide (and related ferrocyanides) for human and animal consumption, demonstrating that they are safe and do not pose cyanide toxicity risks because the ferrocyanide ion remains stable and does not dissociate into free cyanide. Paper [0] and [5] discuss free cyanide toxicity but do not contradict the safety profile of stable ferrocyanide complexes. Therefore, the evidence strongly supports the claim.
M. Younes, P. Aggett, F. Aguilar, Riccardo Crebelli, B. Dusemund, M. Filipič, M. Frutos, P. Galtier, D. Gott, U. Gundert-Remy, G. Kuhnle, C. Lambré, J. Leblanc, I. T. Lillegaard, P. Moldéus, A. Mortensen, A. Oskarsson, I. Stanković, I. Waalkens-Berendsen, M. Wright, A. di Domenico, Henk van Loveren, A. Giarola, Z. Horváth, F. Lodi, R. Woutersen. Re‐evaluation of sodium ferrocyanide (E 535), potassium ferrocyanide (E 536) and calcium ferrocyanide (E 538) as food additives. 2018. https://doi.org/10.2903/j.efsa.2018.5374
Safety evaluations establish that potassium ferrocyanide is safe for consumption within authorized levels as a food additive, because the intact complex does not release free cyanide under physiological conditions.
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Bampidis V, Azimonti G, Bastos ML, Christensen H, Dusemund B, Durjava M, Kouba M, López-Alonso M, López Puente S, Marcon F, Mayo B, Pechová A, Petkova M, Ramos F, Ramos F, Sanz Y, Villa RE, Woutersen R, Aquilina G, Bories G, Nebbia C, Gropp J, Galobart J, Vettori MV, Anguita M, Casanova JO, Amaduzzi A, Innocenti ML. Safety and efficacy of feed additives consisting of sodium ferrocyanide and potassium ferrocyanide for all animal species (Eusalt a.i.s.b.l.).. 2023. https://doi.org/10.2903/j.efsa.2023.7960
Regulatory assessments confirm that potassium and sodium ferrocyanide are safe for use in animal nutrition and do not raise consumer safety concerns despite containing cyanide within their stable coordination structures.
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