I've tried Kefir before. I'm fairly lactose intolerant, but I do okay with moderate amounts of yogurt and cheese, because of the way they are processed. I assumed Kefir would be okay, but for some reason it caused a lot of gas in me. I know that in the past I've seen a soy Kefir, but it's been a while since I've seen it.
There was a thread earlier about
Digestive Advantage. I bumped it so that you could read about
others experiences. Start reading it at the beginning. The thread has been around for a while now. I hope this helps you answer a couple of your questions.
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)