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the claim
Acrid urine smell is caused by specific metabolic waste products
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
4 sources for · 0 against

Specific metabolic waste products and volatile compounds excreted in urine are responsible for its distinct and sometimes pungent odors.

Evidence for · 4
Excretion and perception of a characteristic odor in urine after asparagus ingestion: a psychophysical and genetic study.
2011 · cited by 33
Demonstrates that ingestion of asparagus leads to the excretion of specific sulfurous metabolites that cause a characteristic urine odor.
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The analysis

The retrieved papers consistently show that urinary odors, such as those caused by asparagus, ramson, or metabolic conditions like trimethylaminuria, are directly linked to the excretion of specific metabolic waste products and volatile organic compounds.

More for · 3
Mapping of Urinary Volatile Organic Compounds by a Rapid Analytical Method Using Gas Chromatography Coupled to Ion Mobility Spectrometry (GC–IMS)
2022 · cited by 25
Shows that urine contains numerous volatile organic compounds resulting from metabolic pathways, which can include sulfur and other odorous compounds.
Identification and Quantification of Volatile Ramson-Derived Metabolites in Humans.
2018 · cited by 12
Identifies specific volatile metabolites excreted in urine following the consumption of ramson, contributing directly to its characteristic aroma.
Exploring Trimethylaminuria: Genetics and Molecular Mechanisms, Epidemiology, and Emerging Therapeutic Strategies.
2024 · cited by 3
Explains trimethylaminuria, a metabolic syndrome where the accumulation of a specific waste product (trimethylamine) causes a distinct fish-like body and urine odor.
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 8404 Aug 2026
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