A small scale trial of a form of glucosamine - N-acetylglucosamine or NAG - has shown benefits in reducing the activity of auto-immune T cells in a variety of auto-immune diseases including IBD. See: http://www.sciencedaily.com/releases/2007/05/070514132448.htm
A quick check showed that it is available as a supplement. This may help people who have related auto-immune reactions like AS, lupus and rashes. Check with you GI about
use of this. It seems fairly safe - the IBS trial was done on children.