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From your wikipedia link:

> The ferrocyanides are less toxic than many salts of cyanide, because they tend not to release free cyanide. However, like all ferrocyanide salt solutions, addition of an acid can result in the production of hydrogen cyanide gas, which is toxic.

Doesn't stomach acid qualify as an acid here?

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I'm assuming (maybe wrongly) that if stomach acid was capable of triggering the production of hydrogen cyanide gas, those two linked reports which say "perfectly safe for humans" would say "DO NOT EAT THIS BLOODY HELL WHAT ARE YOU THINKING" instead.

Should we be worried about microdosing toxic chemicals?

Not for cyanide. It occurs in nature far to frequently for us not to be well suited to clear it. Our bodies even convert it to B12 in some cases. A hand full of nuts (organic, free-range, et al) will likely have more hydrogen cyanide than the anti-caking agent in table salt.

https://www.health.ny.gov/environmental/emergency/chemical_t...

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