Vetal Laban Intervention Trial Assessing Bowel Symptoms

Inclusion Criteria: * Males and females aged 18 to 65 years * Subjects fulfilling Rome III criteria for IBS * Sufficient health and orientation for participating in the trial * Obtained his/her informed consent after verbal and written information. * Have a high probability for compliance with and completion of the study. * Body Mass Index (BMI) between 19 and 35. Exclusion Criteria: * Diagnosed or suspected organic gastrointestinal disease (i.e. colitis, Crohn's disease, celiac disease, major bowel surgery, recurrent diverticulitis) or severely impaired general health including cancer and cancer therapy. * Lactose intolerance * Unwillingness to refrain from probiotic use during the trial * Use of antibiotics within the 3 preceding months prior to recruitment * Pregnant, planning pregnancy or lactating * Expected major lifestyle changes related to nutrition, exercise, travelling etc. * Participation in a clinical trial with an investigational product or drug within 3 months prior to screening. * Substance abuse * Subjects unable to read and understand the questionnaires