trustme.bro/r/…
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trust me, bro:
here is the receipt.
the claim
Human flatulence contains methane and is flammable
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

Human flatulence contains combustible gases including methane and hydrogen produced by colonic bacterial fermentation, making the claim trivially true and common knowledge.

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The analysis

The retrieved papers focus on animal enteric methane, natural gas reservoirs, hydrogen sulfide immunity, and human breath tests, none of which directly evaluate the chemical composition or flammability of human flatulence. However, the claim is a matter of basic everyday observation and scientific fact (gastrointestinal gas contains methane and hydrogen, both of which are flammable), rendering it common knowledge requiring no citation.

Everything we examined (12)
We also searched for evidence AGAINST this claim, not only for it.
  1. A review on the use of agro-industrial CO-products in animals’ dietspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Numerical Studies of Gas Production from Methane Hydratespeer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Buffering Adaptive Immunity by Hydrogen Sulfide.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Influence of diet on flatus volume in human subjectspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. High-resolution national mapping of natural gas composition substantially updates methane leakage impactspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Chemical composition with different drying methods and ruminant methane gas production of Palisada perforatapeer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Environmentally oriented techniques to reduce methanogenesis in dairy farmingpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. In Vitro Evaluation of Rice and Maize Gluten Meals in the Concentrate Mixture of Ruminantspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Sub-Antarctic Macroalgae as Feed Ingredients for Sustainable Ruminant Production: In Vitro Total Gas and Methane Productionpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Contribution of oil and natural gas production to renewed increase of atmospheric methane (2007–2014): top-down estimate from ethane and methane column observationspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Hydrogen Production Dynamics During Lactulose Breath Testing in Patients with Suspected SIBO.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Nano/microencapsulation of feed additives for ruminal microbiome modulation and enteric methane mitigation in ruminants: a critical review.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → COMMON KNOWLEDGE · 006 Aug 2026
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