I tried it on and off for a couple years. I never saw any improvement that I thought was tied to it, but I liked the idea that it was soothing for my intestines. I read about it on dr. andrew weil's website and I think the site had some slippery elm tea preparation tips. I used to mix the powder with hot water and maybe add honey. It definitely didn't make me worse. You probably have nothing to lose in trying it.
UC for the last ten years
Current Meds: 6MP since 2006, Lialda, Asacol foam, Lomotil
Past Meds: You name it; I've tried it. (Asacol, Colazol, Pentasa, DiPentum, Rowasa, Canasa, Cortenema, sulfasalazine, Cortifoam)
Alternative treatments I have had success with: Acupuncture, Hypnotherapy