ManhattanMama,
Interesting question.
I tried acupuncture for other reasons, way before I was diagnosed with UC, but while having all the symptoms of UC including heavy and continual rectal bleeding - so in retrospect it should have helped my UC, BUT it didn't. I went to a classicly (sp?) trained chinese acupuncture doctor trained in China and she actually worked in a chinese hospital and also taught other acupuncture chinese students as well. She came highly credentialized.
So, no for me, it didn't work.