In general, kombucha is perceived as a probiotic beverage, supporting a healthy gut. The exact reason why people experience irritable bowel syndrome (IBS) is hard to pinpoint. Every microbiome is different. What works for some might not work for others.
Kombucha contains no gluten, which is one of the main causes of IBS, but does contain some FODMAP's, which can trigger IBS in some people.
If you experience IBS we suggest to include kombucha slowly into your diet and see how your body responds.