Inclusion Criteria:  Patients ≥ 18 years of age with a J-pouch PDAI ≥ 7 Established diagnosis of chronic pouchitis (≥3 times of pouchitis within the last year, symptoms more than 4 weeks despite antibiotic treatment) Antibiotic treatment for pouchitis (ciprofloxacin and/or metronidazole) within the 3 months  Exclusion Criteria:  Immunosuppression Pregnancy or breastfeeding Evidence of intestinal pathogen bacteria in the stool at inclusion visit Any severe or newly diagnosed concomitant cardiovascular, hepatic, intestinal, renal, endocrine, pulmonary, dental disease with inflammation or psychiatric disorder, which, in the opinion of the investigator, might have an influence on the patient's compliance or the interpretation of the results Probiotic intake within the last 2 weeks prior to study intervention Participation in another clinical trial within the previous 30 days before baseline Serious food allergies with earlier anaphylactic reactions