How can oil of oregano be used to help ibs

I cannot answer this question. The evidence block contains no studies on oil of oregano and IBS in humans. The only retrieved record is a 2017 study on oregano oil in broiler chickens, which does not address irritable bowel syndrome in people. There is nothing here to ground an answer in. A useful sub-question would be whether any human trials exist comparing oil of oregano against placebo for IBS symptom scores, but no such records were retrieved.