According to WebMD, some studies have indicated that probiotic supplements, specifically ones with a great amount of Bifidobacterium infantis, help with various IBS symptoms, including bloating, abdominal pain and irregularity of bowel movements. Probiotics do not cause any harm.
According to WebMD, no single remedy is successful at alleviating symptoms for everyone with IBS. Prebiotics are another option for treating IBS. Prebiotics are nondigestible food ingredients that encourage microorganism activity in the stomach. According to WebMD, results from studies looking at the effects of prebiotics are largely inconclusive. One study showed a vast improvement in IBS symptoms from a combination of prebiotics and probiotics, while another study only examining prebiotics showed no benefits.