Probiotics, prebiotics, and synbiotics have all been studied for IBD, but they appear to be much more effective in ulcerative colitis than in Crohn’s disease.[1][2] Resveratrol could improve both GI symptoms and quality of life.[3] Finally, there's a trial that suggested that boswellia may reduce disease activity to a similar degree to mesazaline, but more evidence is required to confirm these findings.[4]