Some people have slow gastrointestinal motility or slow metabolism. Oral probiotics can promote human metabolism, reduce blood fat and lose weight, which is also good for human skin health. Regular supplementation of probiotics can prevent urogenital infection, lower cholesterol and prevent osteoporosis. For lactose intolerance patients, it can also play a therapeutic role. Therefore, infants can take lactic acid bacteria together with milk when eating it, which can alleviate the diarrhea symptoms caused by drinking milk.