Peppermint oil
Beat placebo for IBS symptoms, with more side effects.
Grade B: Some human proof
Small, early or mixed results in people.
The grade is for the use people talk about, not for every use. Filed under: Gut health.
How it works
Its menthol relaxes the muscle in the gut wall.
How it was given in studies
By mouth. In the trials people swallowed it as a capsule, tablet, powder or drink.
This is what the studies did. It is not a how-to.
What studies saw
A review of 10 trials in 1,030 people with IBS found it beat placebo for overall symptoms and for belly pain.
The trade-off
Side effects were more common than on placebo, and the reviewers rated the quality of the evidence as very low.
When it showed up, in studies
Trial lengths varied. No clear timeline.
Sources
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Keep going
We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.