Well according to this link [1] the LD50 for zinc is close to 3 g/kg body weight, more than 10-fold higher than cadmium and 50-fold higher than mercury.

If this is wrong for humans, then the US Govt is certainly not giving a toss about its unqualified statements!

Stomach acid dissolves metallic zinc, producing zinc chloride, which is a corrosive product damaging the stomach lining.

And if the British Govt was really bothered about our health, it wouldnt allow very hard water with lots of lime scale that inhibits zinc uptake, and if the medical experts were that bothered, they would be checking our diets, but they dont, just like they dont bother about tobacco products.

Some many expert criminals its hard to know who to listen to.

[1] https://pubchem.ncbi.nlm.nih.gov/compound/Zinc#section=Toxic...