A substance produced within an organism's own body that acts as a poison or toxin.
From Greek 'autos' (self) + Latin 'intoxicare' (to poison). This medical term emerged in the 19th century when scientists discovered that bodies could generate their own toxic compounds.
Your body can poison itself—some metabolic byproducts from normal digestion can be mildly toxic, which is why your liver works so hard to detoxify everything constantly.
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