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There is a concept in toxicology that originated from Paracelsus and is paraphrased as “The dose makes the poison.”
It reminds us that all chemicals can be toxic to humans, depending on the dose. Water can kill you if you drink more than your body can handle. Even table salt is deadly if the dose ingested is high enough.
It is also important to understand that the ability to produce toxicity has nothing to do with whether a chemical is natural or synthetic (man-made).