L-Glutamine 

3,500mg is the primary “fuel” your intestinal cells use for energy, the more they have, the better they are able to support the health of the lining of your intestines. (13) L-Glutamine supports healthy gut lining and integrity. (14)

13. Lancet. 1993 May 29;341(8857):1363-5

14. Dig Dis Sci. 2012 Apr;57(4):1000-12