New research is now showing that L-Glutamine benefits the body in the following ways:
1. Improves gastrointestinal health
L-glutamine benefits your health if you have any type of digestive issue, such as irritable bowel syndrome (IBS), an inflammatory bowel disease like Crohn’s disease, ulcerative colitis, diverticulosis, diverticulitis, leaky gut or any of the issues associated with leaky gut (like joint pain, rosacea or any type of autoimmune response). Because it’s a vital nutrient for the intestines to rebuild and repair, you need this amino acid in your diet on a regular basis.
2. Helps leaky gut and ulcers
There are millions of people struggling with a condition called leaky gut syndrome, which is essentially the main cause of autoimmune disease today. Leaky gut can cause thyroid issues like Hashimoto’s disease; it also contributes to arthritis, skin issues like psoriasis and other serious health issues.
3. Boosts brain health
A precursor to the neurotransmitter glutamate in your brain, glutamine is key to boosting your brain health. Why? A disruption of the glutamine-glutamate cycle can result in all kinds of brain problems, including Reye’s Syndrome, epilepsy, bipolar disorder, schizophrenia, anxiety, depression and alcohol addiction. 
4. Improves IBS and diarrhea
Glutamine helps improve IBS and diarrhea by balancing mucus production, which results in healthy bowel movements. If you have Hashimoto’s or an underactive thyroid, it should be a part of your hypothyroidism diet. If you suffer from IBS symptoms like constant diarrhea or ulcerations, it needs to be part of your IBS diet.
5. Promotes muscle growth and decreases muscle wasting
Whether your goal is to increase athletic performance, boost metabolism, improve recovery or even build muscle, research shows that L-glutamine can significantly aid your efforts. During an intense workout, your body becomes stressed and your muscles and tendons require more glutamine than the amount supplied by a normal diet.
6. Improves athletic performance and recovery from endurance exercise
One of L-glutamine’s main roles in the body is to support detoxification by cleansing the body from high levels of ammonia. It acts as a buffer and converts excess ammonia into other amino acids, amino sugars and urea.
7. Burns fat and improves diabetes
Research has indicated that HGH levels are up by nearly 400 percent after glutamine supplementation. This hormonal response leads to an increase in resting metabolic rate and improves the after-burn effect or EPOC post-exercise. This afterburn effect is essential for burning fat, weight loss and building lean muscle mass