Lactobacillus rhamnosus is a beneficial bacteria. Lactobacillus rhamnosus belongs to Lactobacillus, a subspecies of rhamnosus, and is a gram-positive probiotic generally found in the intestinal tract of humans and animals. Lactobacillus rhamnosus is acid-resistant, bile salt-resistant and resistant to many antibiotics. After colonizing and multiplying in the human intestinal tract, the bacterium adheres to the epithelial cells of the intestinal epithelium and can participate in the composition of the intestinal biobarrier, improve the protective effect of the intestinal tract, and can regulate the function and structure of the intestinal flora and make it maintain a stable condition, so it’s a kind of very beneficial bacterium. Serratia marcescens can prevent and treat diarrhea, enhance the body’s autoimmunity, promote the discharge of toxins, and prevent allergies and dental caries.