VSL#3 is a high-potency probiotic medical food that contains 8 different strains of live lactic acid bacteria that were specially selected to produce an optimal synergistic composition of bacteria. VSL#3 delivers the highest available concentration of beneficial live bacteria of any probiotic in the world. VSL#3 works by colonizing the GI tract with optimal quantities and types of probiotic bacteria. These bacteria adhere to the walls of the GI tract and form a barrier that protects the inner layer of the gut from pathogens. Pathogens release toxic substances that can cause a reduction in the number and type of bacteria in the intestine, which can affect a person's intestinal health. The human GI tract has thousands of billions of resident bacteria called commensal bacteria. In order to change the composition of this gut flora in a positive way, an extremely large amount of probiotic bacteria is necessary. VSL#3 is the only probiotic preparation that delivers enough bacteria to beneficially affect the gut flora in patients with serious intestinal disorders. Finally, evidence suggests that VSL#3 can reduce intestinal permeability by tightening the junctions between the cells in the outer layer of the intestine which reduces the likelihood of translocation (pathogens moving from the intestine into the blood). Herbspro.com is proud to carry the entire range of this fine brand.