A substance in urine that is produced by the body's own tissues or organs, or the reabsorption of one's own urine.
From auto- (self) + urine. A medical/physiological term from late 19th/early 20th century research.
Autourine became famous in alternative medicine (where some people claimed drinking it had health benefits), but scientists studying it found it was mostly just recycling waste products—the body carefully filters urine out for a reason!
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