The intestine is different from other organs. The nerve plexus is dense. Just like the brain, it can secrete various hormones and produce neurotransmitters. As early as 1907, Byron. Dr. Byron Robinson proposed the theory of "abdominal brain", and in 1998 Professor Michael D. Gershon of Anatomy and Cell Biology at Columbia University also proposed the theory of "second brain". Kulreet Chaudhary, a neurologist at Scripps Memorial Hospital in the United States, also pointed out that the enteric nervous system, like the brain, also sends and receives messages, records ordinary experiences, Also affects emotional ups and downs. Dr. Chadri believes that the brain is actually mostly hearing commands, and the enteric nervous system is responsible for issuing 90% of the commands. Therefore, the health of the intestine will affect the whole body, and its importance cannot be underestimated. Because probiotics have the benefits of anti-allergy, immunity enhancement, and constipation relief, the probiotics have become an indispensable essential for health care in recent years. According to the "Daily Mail" on April 7, 2017, probiotics have many unknown properties. https://eu.echemi.com/info/12-benefits-of-probiotics_109046.html