The amino acid Glutamine may be helpful for maintaining a healthy digestive system. It also aids muscle recovery after exercise and is important for healthy immunity. The slightly sweet powder can be stirred into water or juice or sprinkled on food. Although taken for Leaky Gut problems more commonly than any other purpose, Glutamine is actually the most prevalent amino acid in the human body. It has a wide range of functions including providing antioxidant support, supporting the immune system, tissue growth and kidney and brain function.