Also used as a coating in welding among other things. And like other commentor said, a nephew of cyanide.
Now Im sure most of us will be fine, but I prefer not to eat that a few times a day. If you think that makes me foolish, be my guest.
It's also not needed, there are plenty of other sources of Iodine, and sea salt from the grinder is perfectly fine.
Cyanide is so toxic because it has a high affinity for iron ions, so it deactivates iron-containing enzymes that are crucial for respiration. But in ferrocyanide it is _already_ combined with iron.
Ferrocyanide compounds like Prussian blue are even sometimes used as an antidotes for heavy metal poisoning.
We simply don't know, and haven't research the longterm effect of small dosis on a daily intake. Especially combined with other conservatives & chemical additives in small dosis.
You can't deny there are some major diseases in the modern world on a rise and we have no idea why.
Yet here everyone always so sure that everything we're doing with food additives, pesticides and chemical processing is super safe.
There's just no need to eat these things, just eat normal food.
For cyanide? We actually do. Cassava roots contain quite a bit of it, and they are used as a staple in some places in Africa. You can indeed can get chronic poisoning, but it requires A LOT of cyanide.
Also, not sure what the relevance to iodine is?
Incidentally, iodine isn't easily sourced in some countries, due to soils that contain very little of it. My country (NZ) used to have a very real goitre problem until the introduction of iodised salt in the 1920s.
Now that does seem like a bit of a concern, doesn’t it?