How do probiotics work for ulcerative colitis? since it is an autoimmune disease wouldn't the overactive immune system fight the probiotics?

Research ongoing: Some experts feel that good bacteria block some of the harmful reactions in ulcerative colitis. I feel that taking probiotics may help and certainly shouldn't do any harm in ulcerative colitis.

The Microbiome... : Great thought question. However, it isn't all about the immune system - we recently are beginning to understand the role of the community of micro- organisms in the gut (the microbiome). By altering the natural composition and exposure to certain foods early in life, our immune system over-reacts to certain proteins and microbes that would otherwise be harmless.