The Smell of Asparagus Urine Part 4 ChemistryViewsAsparagus may cause a unique odor inside your urine. It is widely known that ingesting this verdant plant can cause a powerful fragrance during a trip to the lavatory. If you observe an offensive smell once you've indulged comprising asparagus, do not be alarmed. It is just a natural response that occurs internally. Rest assured that the odor poses no harm and will go away over time.