Efficacy of a Multi-strain Probiotic in the Treatment of Irritable Bowel Syndrome (IBS)

Inclusion Criteria: * Male and female subjects aged 18-64 * A diagnosis of Irritable Bowel Syndrome as per ROME III criteria * A classification of mild irritable bowel syndrome as indicated by the Irritable Bowel Severity Scoring System (score \>75) * Female subjects currently using an acceptable form of birth control who agree to maintain its use throughout the study (e.g. abstinence, oral contraceptives, barrier methods) * Subjects who agree to maintain their current eating habits throughout the study * Ability to understand and sign the Informed Consent Form Exclusion Criteria: * Female subjects who are breastfeeding, pregnant, or are open to becoming pregnant in the next three months * Subjects currently receiving medication for the treatment of IBS symptoms * Subjects currently receiving natural health products for treatment of IBS symptoms will be eligible for inclusion in the trial is they agree to undergo a two week washout period * Subjects currently experiencing nausea, fever, vomiting, bloody diarrhea or severe abdominal pain * Subjects who are immune-compromised (e.g. AIDS, lymphoma, patients undergoing long-term corticosteroid treatment) * Subjects currently receiving antibiotic therapy or antibiotic therapy within the previous month * Subjects regularly consuming probiotic containing products (e.g. yogurts, etc.) * Subjects who have recently (\< 3 months) initiated dietary measures to control IBS symptoms * Subjects with a history of major or complicated gastrointestinal surgery * Subjects with severe endometriosis * Subjects with malignant tumors or subjects undergoing chemotherapy or radiation therapy * Subjects with severe IBS and that require medication * Subjects with weight loss, anaemia, inflammatory bowel disease, celiac sprue, family history of colorectal cancer * Subjects exhibiting or indicating thoughts of suicide currently or in the past as based on patient screening interview by the investigator/clinician. Appropriate referral to a health care provider will be provided * Subjects with known allergies to milk or milk based products * Subjects using and/or have used antipsychotic or anticholinergic medication within the prior month, those with reported significant abnormalities on the thyroid function tests, blood counts and serum chemistry * Subjects 50 years or older who have been diagnosed with IBS and have not received a colonoscopy in the last five years.