> Is it possible to make a substance that is universally 100% excreted by every organism? First of all, it is very unlikely. But even if it could be theoretica

> Is it possible to make a substance that is universally 100% excreted by every organism? First of all, it is very unlikely. But even if it could be theoretically possible, I very much doubt anyone would spend money to make it universally excretable. They will stop at humans, and maybe (luckily) at mammals.