People can not eat iris. It has chemicals in the root and leaves that are toxic.

All animals are affected by toxic chemicals.

The question is toxic to what. Not all chemicals which are toxic to humans are toxic to bacteria, and some chemicals which are toxic to bacteria are harmless to humans (which is why we can have antibiotics).

There are chemicals (like Hydrogen Sulfide) which are very toxic to mammals that SOME bacteria eat as food.

But there are other chemicals like chlorine which are toxic to both humans and bacteria.

So the question does not have a simple answer.

There are too many to name. Assume all chemicals in lab are toxic.

Green chemistry focuses on eliminating the use of toxic chemicals in chemistry without stifling.