A lot of people, especially women, get serious relief from IBS by consuming peppermint oil. It was known anecdotally for years before it was scientifically determined that the oil soothes intestinal spasm at the cellular level.
The trick is how to get it there without irritating the mouth, throat and esophagus. Pills seem to be the best bet.
...serious relief from IBS...
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We chew/suck on candied ginger. Peppermint tea also works well. Longer term, probiotics, especially from fermented foods, are effective.