There are soooo many different probiotics that you can take. You have to try one (or 10) to see what works best for you. I take one called Jaro Dophilous whic has 3.4 billion CFU (live bacteria) and 6 different strains. I get mine from a local whole foods store and its only about $10 for 100 capsules (i take 1 a day).
I've heard that there is one called Align??? that is apparently very good but you have to buy it online and it is very expensive.
Age: 25 / Male / Florida
Diagnosed: 11/08 / Pancolitis
Asacol - 2 x 3 day (waiting for results)
Prednisone / ended 1/09 (started at 30mgs and tapered down)
Mens Multi Vitamin - 1 a day
Metamucil Wafers - Once a day
Jaro - Dophilus Probiotic (3.4 Billion) - 1 a day
Diagnosed with PSC: 3/9 --now taking Urso