Published online May 7, 2013. doi: 10.3748/wjg.v19.i17.2718
Revised: January 28, 2013
Accepted: February 28, 2013
Published online: May 7, 2013
Core tip: Nine intractable ulcerative colitis patients using the herbal medicine Qing Dai were observed in a retrospective observational study. After 4 mo of treatment, clinical activity and endoscopic findings improved dramatically in most patients. Electron spin resonance revealed that Qing Dai has a strong radical scavenging effect.