The star strain in Primadophilus Reuteri is Lactobacillus reuteri, a unique probiotic strain that has been shown to colonize the intestines and help maintain digestive balance.* The formula also contains prebiotics, a food source for probiotics.* Lactobacillus Reuteri, Lactobacillus Acidophilus, 2000 Calorie Diet, Stomach Acid, Immune Health, Food Source, Calorie Diet, Healthcare Professionals, Probiotics