Probiotics, a class of active microorganisms beneficial to the host, is a general term for active beneficial microorganisms that are colonized in the human intestinal reproductive system and can produce exact health effects, improve the host microecological balance and play a beneficial role. Human beneficial bacteria and fungi, mainly Lactobacillus, Bifidobacterium, Actinomyces, yeast, etc., are suitable for the following groups of people: 1. Probiotics are suitable for children born by caesarean section, premature babies, and patients with low immunity. 2. People with diarrhea and constipation, infectious diarrhea caused by bacteria, viruses, and protozoa. 3. Patients with tumors undergoing chemotherapy and radiotherapy, which can easily lead to dysbiosis in the intestine. 4. Patients with cirrhosis of the liver and Patients with abdominal inflammation. 5. Patients with enteritis. 6. Patients with indigestion.