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Summary of Flatulence

Primary Information, Benefits, Effects, and Important Facts

Scientific Information on Flatulence

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Human Effect Matrix

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect flatulence.
Grade Level of Evidence
Robust research conducted with repeated double-blind clinical trials
Multiple studies where at least two are double-blind and placebo controlled
Single double-blind study or multiple cohort studies
Uncontrolled or observational studies only
Level of Evidence
? The amount of high quality evidence. The more evidence, the more we can trust the results.
Supplement Magnitude of effect
? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
Consistency of research results
? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
grade-c Minor - See study
Flatulence as a side-effect of IBS is reduced with ingestion of peppermint oil
grade-d Notable Very High See all 4 studies
Both acute lactase supplementation and pretreatment of milk led to notable reductions in flatulence, as could be expected from the reduction in lactose fermentation. It's unclear which is more effective.
grade-d Notable - See study
Notably effective as dietary fibers should normally enhance flatus (almost being a 'per se' effect of dietary fiber) yet psyllium has noted the opposite effect.