There are a few probiotics that have been clinically tested for IBS. The two most talked about ones are Align and VSL#3. Align as I recall is suppose to be more effective. Both work with all types of IBS. Digestive Advantage is another probiotic that has had some small clinical trials that show it is somewhat effective.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS