How much ferrocyanide do people actually consume from salt, and is it safe?
What the Evidence Shows
What we've found so far is that the amount of ferrocyanide people consume from table salt appears to be very low. Even for those who eat a lot of salt, the intake of ferrocyanide stays well below established safety limits [1].
Our analysis of the available research shows that ferrocyanide is sometimes added to table salt to prevent clumping, but the quantities used are small. Based on what we've reviewed so far, typical dietary exposure to ferrocyanide through salt does not come close to reaching levels that would raise safety concerns . This means that, under normal eating patterns, the contribution of ferrocyanide from salt is minimal.
We want to be clear that our current analysis is based on limited evidence—only one assertion was available for review, supported by two study references. While the evidence we've reviewed leans toward the idea that ferrocyanide exposure from salt is not a concern, we can’t rule out gaps in long-term or high-exposure scenarios. There isn’t enough evidence yet to say how this holds up across different populations or diets.
Because this is a narrow body of findings, our understanding could change as more data becomes available. We’re not making any final judgments about safety overall—just reporting what we’ve seen so far.
Practical takeaway: If you're eating table salt that contains ferrocyanide, the amount you're likely getting is very small and, based on current evidence, doesn't appear to be a cause for concern. But we’re continuing to analyze new research as it emerges.