A wise older vet gave me insight

Maybe this is round cows in a vacuum.

You know what a really good rat poison is, A huge amount of D3. Same reasons, causes soft tissue mineralization, GG kidneys, and stuff stops coming out of the other end. Technically it happens to insect feeders too.
You know how much "pure calcium" it takes to kill a human? about a scoop the size of the women's finger nail.

Lucky us we use calcium carbonate and calcium citrate. And our D3 is measured in mg per kg.
 
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