Here's a wikipedia link on probiotics:
To get ideas of what people take, look at their signatures. Most people list their meds, supplements, and probiotics. Each different formula has different benefits, and some people respond better to one kind than another. When you start taking them, if one doesn't help you, don't lose faith, just try a different brand. I don't think I've seen anyone here who hasn't benefitted from the use of probiotics.
36 y.o. male
Diagnosed w/ moderate UC in May '06
Asacol, Florastor, VSL#3, Wellbutrin XL, Prozac, multi-vitamin, Allegra, Lialda, Colocort enema, Prednisone (trying to taper down)