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4. Calm an upset stomach

Animal studies show promise that peppermint eases pain in the digestive system by preventing smooth muscles in the gut from contracting. In a systematic review of nine research studies, which included more than 700 people with irritable bowel syndrome (IBS), treatment with peppermint oil for two weeks provided significantly better relief of symptoms than for those who took a placebo. Also, a review of 14 clinical trials involving 1,927 children and adolescents with gastrointestinal disorders showed that peppermint oil reduced the frequency, duration and severity of abdominal pain.