What are the effects of glutamine in the body

glutamine is a non-essential amino acid and I understand that it's excitatory in the nervous system which can be dangerous. I also understand that its anti-catabolic but this only applies to muscle tissue and the skeletal system. does it have anti-catabolic properties in the organs of the digestive system.  I understand that this substance is used to prevent a leaky gut I want to understand what exactly glutamine does to the intestine to prevent a leaky gut does it stimulate action potential in the intestine to absorb water or does the substance itself absorb the water of a leaky gut to solidify fecal matter