Effect of BIO-K+ on Symptoms of Irritable Bowel Syndrome

Given the promising clinical results of previous trials of probiotics for IBS symptoms, the
objective of this clinical trial is to evaluate the safety and effectiveness of a
proprietary probiotic product, Lactobacillus acidophilus CL1285® and Lactobacillus casei
LBC80R®, on symptoms of IBS in otherwise healthy adults.

Inclusion Criteria:

1. Age 18 years or older

2. Subject meets Rome III criteria for IBS (regardless of IBS subtype) as follows:

- Recurrent abdominal pain or discomfort at least 3 days/month in the last 3
months associated with 2 or more of the following:

- Improvement with defecation

- Onset associated with a change in frequency of stool

- Onset associated with a change in form (appearance) of stool

- Symptom onset must be at least 6 months prior to diagnosis

3. Agree to use contraception throughout study period, unless postmenopausal or
surgically sterile (females only)

4. Able to understand the nature and purpose of the study including potential risks and
side effects

5. Willing to consent to study participation and to comply with study requirements

- Abdominal pain or discomfort at least 2 days during run-in period associated
with 2 or more of the following:

- Improvement with defecation

- Onset associated with a change in frequency of stool

- Onset associated with a change in form (appearance) of stool

- Completion of all study-related questionnaires

Exclusion Criteria:

1. Diagnosed gastrointestinal disease, e.g. Crohn's disease, ulcer, cancer

2. Prior abdominal surgery that, in the investigator's opinion, may confound study
outcomes

3. Any systemic disease that may confound IBS symptoms or compromise subject safety

4. Life expectancy < 6 months

5. Pregnant female or breastfeeding

6. Lactose intolerance

7. Immunodeficient subjects

8. Uncontrolled psychiatric disorder

9. Current treatment with nasogastric tube, ostomy, or parenteral nutrition

10. Eating disorder

11. Recent (< 2 weeks) antibiotic administration

12. History of alcohol, drug, or medication abuse

13. Daily consumption of probiotics, fermented milk, and/or yogurt

14. Known allergies to any substance in the study product

15. Participation in another study with any investigational product within 3 months of
screening