It's a good thing zero-carb isn't homeopathy, then. If said thing is perhaps a container for chemicals, then it being full of chemicals would be a good thing, since it would be fulfilling its function. I'm not sure what you're getting at.

"Toxin" does in fact mean "bad to humans," by definition. And no, we haven't, agriculture is only about 10,000 years old. You are of course free to ingest as many toxins as you feel comfortable with, that's entirely your decision.

Btw, I'd like to gently remind you of Rules 1, 2, and 4 in this community. Consider this a light warning.