Potassium Ferrocyanide
The short version
The standard EU anti-caking agent for table salt — controversial in popular health narratives, regulated at very low residual.
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 0–0.025 mg/kg body weight (JECFA). Despite the cyanide groups in the formula, the iron-cyanide complex is thermodynamically very stable and the cyanide is not released under physiological conditions. Repeated misinformation panics around table salt do not reflect the actual chemistry. Banned in some countries (e.g., a few US states' organic standards) more on precautionary than evidence-based grounds.
Educational information only. Not medical or dietary advice.