Do you suffer from digestive concerns involving constipation, diarrhea, bloating or abdominal pain? The Canadian College of Naturopathic Medicine (CCNM) is conducting a clinical trial on the effectiveness of a probiotic supplement on the reduction of symptoms associated with moderate-to-severe Irritable Bowel Syndrome (IBS Participants will visit the clinic on four different dates (approx 30 minutes each visit) over a 3 month period, where they will follow up with a Naturopathic Doctor and complete questionnaires about their IBS symptoms. Compensation upon completion of the study = $200 + $200 in follow up appointments with a Naturopathic Doctor. Criteria for participation: - Male and female patients between 18 and 64 years of age - Who have been diagnosed with moderate-to-severe Irritable Bowel Syndrome or have symptoms suggesting moderate-to-severe IBS - Are not already taking prescription medication for their IBS symptoms - Do not have Ulcerative Colitis, Crohn’s, or Celiac’s Disease - Are not planning on becoming pregnant in the next 3 months This study will take place from January 2014 to April 2014. Please inquire via this posting (include your phone number and the best time of day to reach you) and you will be contacted for a brief phone screening to assess for eligibility and to answer any questions you may have.