A Multi-center Human Study to Evaluate the Efficacy and Safety of ®GI Flora in Subjects With Irritable Bowel Syndrome

A Multi-center, Randomized, Double-blinded, Placebo-controlled Human Study to Evaluate the Efficacy and Safety of probiotic mixture(®GI Flora) in Subjects with Irritable Bowel Syndrome. Regimen: 6 probiotics mixture \>10\^9/D for 8 weeks Primary variable: visual analogue scale(VAS) assessment for abdominal pain Secondary variable: 1. change of VAS score for abdominal pain/discomfort after 4/8-week treatment 2. daily symptom score for bloating, defecation discomfort(strain/urgency/incomplete evacuation), flatulence , feces shape, frequency of bowel movements