Would Metamucil kill ants ?

I highly doubt it but the artificial sweetener in it will kill them.

Aspertame is deadly to ants and will kill them quickly. You can buy this artificial sweetener almost anywhere and it really works good. Better and faster than cornmeal. It will even kill fire ants.

Metamucil does have Aspertame in it but it would be best to just buy that instead.

I think they will die from pooping themselves to death.