The three probiotic strains selected in Vilardell Digest Probisec come from two species of Lactobacilli: Lactobacillus acidophilus (BIFOLAC® 5) and Lactobacillus rhamnosus (BIFOLAC® PB01) and one species of Bifidobacteria: Bifidobacterium animalis spp Lactis (BIFOLAC® 12). Studies conducted with these strains have demonstrated beneficial effects on restoring normal intestinal function after diarrhea associated with antibiotic use, as well as restoring normal intestinal microbiota. Furthermore, the presence of Zinc contributes to the normal functioning of the immune system. Directions for use: Take 1 stick daily. Place the powder directly into your mouth. It dissolves instantly on the tongue without the need to drink water.