An Introduction To Toxicology -

: Toxins are naturally occurring poisons (e.g., snake venom), while toxicants are usually man-made byproducts.

Toxicology is the scientific study of the adverse effects that chemical, physical, or biological agents have on living organisms. Often summarized by Paracelsus’s maxim, "the dose makes the poison," the field focuses on how the amount and duration of exposure determine the severity of a toxic response. An Introduction to Toxicology

: Foreign substances (like drugs or environmental pollutants) that are not naturally found in the body. : Toxins are naturally occurring poisons (e