Actually, it is the most abundant amino acid in your brain. There are abundant health benefits of L-glutamine. Though previously L-glutamine was used for the muscle building, weight loss and burning fat purposes, now science is showing that it is beneficial for improving brain health and overall physical health. It is very much helpful for the patients who are suffering from physical trauma such as burns or muscular wounds (knife wounds) or in disease states in which muscle wasting occurs, such as AIDS.

1. Improves gastrointestinal health [2]
2. Helps leaky gut and ulcers [3]
3. Supports the immune system against infections [4]
4. Improves cognitive function [5]
5. Promotes muscle growth and decreases muscle wasting [6]
6. Improves athletic performance and recovery from endurance exercise [7]
   Relieves wound healing [8]
7. Decreases side effects of chemotherapy [9]
8. Burns fat and improves weight loss [10]
9. Helps with diabetes [11]
10. Helps reduce oxidative stress [12]
11. Protects heart health [13]
12. Improves liver health [14]
13. Improves IBS and diarrhea [15]
14. Attention deficit-hyperactivity disorder (ADHD) [17]

Improves learning and memory [18]

Moreover, glutamine is used for improving recovery after bone marrow transplant or bowel surgery, increasing well-being in people who have suffered traumatic injuries, and preventing infections in critically ill people.
It is used for digestive system conditions such as stomach ulcers, ulcerative colitis, and Crohn’s disease. It is also used for depression, moodiness, irritability, anxiety, insomnia, and enhancing exercise performance.
Some people who have HIV (AIDS) occasionally use it to inhibit weight loss (HIV wasting).  Glutamine is also used for attention deficit-hyperactivity disorder (ADHD), a urinary condition called cystinuria, sickle cell anemia, and for alcohol withdrawal support.[16]