The language surrounding what toxins are is purposely vague. The Merriam-Webster definition for toxin states, "A toxin is a poisonous substance that is a specific product of the metabolic activities of a living organism, and is usually very unstable, notably toxic when introduced into the tissues, and typically capable of inducing antibody formation." Simply put, a toxin is harmful matter. The reason for this ambiguous language is due to the many types of toxins, all with different and potentially detrimental effects. For the purpose of clarity and consistency in our detox book, we break down toxins into three categories: internal toxins, external toxins, and toxic behaviors.