The best example is table salt, NaCl, that all of you use. However, I can kill you with NaCl. It's just a matter of how much you use.
Toxicity is all about dosage. By dosage, we mean the concentration and the duration of the exposure. I am currently breathing 418 parts per million of carbon dioxide in the atmosphere here. Carbon dioxide is not toxic for me, but the dosage could lead to a toxic situation, if the concentration were greatly increased.
Saying that such and such a substance is toxic is linguistic inflation, because almost anything can be toxic if the concentration is high enough. The doses that we are exposed to do not put us in a situation of toxicity. The word ”toxic” is sometimes used as a bogeyman, to scare people, but we must not use it like that.