Lactobacillus Reuteri is a probiotic and can be found in human breast milk as well as the gut of some mammals and birds. It's beneficial properties have recently been studied and the results seem very promising.
In one study conducted L. Reuteri was tested vs. simethicone drops in the treatment of colicky infants. After one week the L. Reuteri had caused an improvement in the symptoms of the infants in the study group (1).
Light has been shed on exactly why this treatment works in a more recent study published by the Federation of American Societies for Experimental Biology (FASEB) online journal. They found through studies done in mice that a specific strain of L. Reuteri reduced the force of muscle contraction with in the GI tract mere minutes after exposure (2).
If you suffer with Inflammatory Bowel Disease or Irritable Bowel Syndrome you may want to discuss with your doctor whether L. Reuteri could be an adjunct to your current therapy. I have found that the supplements BioGia provides have given good results for our family, especially to counter the side effects of antibiotics.
Check with your doctor before changing your treatment plan in any way!