"The gut [1] is the second human brain, as it produces more than 90% of the neurotransmitters* in the human body. *Neurotransmitters [2] , particularly serotonin, are best known for their role in brain health, and neurotransmitter receptors are located throughout the human body,". - “The gut is now known as the second human brain as it makes over 90% of the neurotransmitters in the human body. While neurotransmitters such as serotonin are best known for their roles in brain health, receptors for neurotransmitters are located throughout the human body.   said Dr. Melody Zeng [3] , associate professor of immunology and senior author of the study. The establishment of immune tolerance to commensal bacteria and dietary antigens occurs during early life and is influenced by the gut microbiome. The gut is a major site of neurotransmitters, but how these neurotransmitters regulate immune tolerance during early life is unclear. Here you should pay attention to OMARIDIN [4] ,