Recently I've been doing lots of research on probiotics and for the last 3 weeks have been taking one called IBS support http://www.ethicalnutrients.com.au/featured%20product-ibs.htm (Aust) which has 15 billion lactobacillus plantarum organisms in it. During this time I have had no D at all and no urgency (and I have been eating some things that I know usually bother me). I have still had 3 - 4 BM's/day - more than I would like but manageable. Another organism which is supposed to be helpful is called Bifidobacterium infantis 35624 (which is in Align, available in the US) and in a product I can get here called OMX Probiotic Formula http://www.omx.co.nz I might try this next. I wondered if anyone has had any long term success with any probiotic? I'm asking because I have always suspected there was a connection with bacteria. I first got very bad D which wouldn't go away after taking a probiotic with lactobifidus and acidophilus in it. After a while I was diagnosed with IBS 8 years ago and my gastroenterologist put me on 3 courses of very strong antibiotics and for 14 weeks after I was completely normal - I was so thrilled and thought I was cured. Then the IBS D came back. He put me on the courses again and this time I was symptom free for 8 weeks but it all came back again. I've tried it again since but this regime now has no effect and I have had multiple other treatments over the years with limited success. I am interested to know if taking probiotics longterm works and what the best strains are? It's early days but I am starting to get excited again.