Characteristics of excluded studies [ordered by study ID]

Study	Reason for exclusion
Ahuja 2011	This randomized, double-blind, trial studied the efficacy and safety of curcumin enema plus oral 5-ASA, compared with placebo enema plus oral 5-ASA in 43 ulcerative colitis patients with active mild to moderate proctitis
Atkinson 2003	The study, published as an abstract, enrolled patients with IBD and randomised them to either curcumin therapy or placebo. Since the data for patients with ulcerative colitis were not provided separately by the authors, we excluded this study. We attempted to contact the first author of this study but did not get any reply
Holt 2005	This study was a case-series in which all patients were administered curcumin therapy