Glutamine is the most abundant non-essential amino acid in the human body.
The endogenous synthesis is greatest in the muscles, lungs, brains and fat tissue. Under certain conditions (in periods of recovery, with great physical effort), the glutamine synthesis may be insufficient to meet the need.
For this reason, glutamine is grouped under the semi-essential or conditionally essential amino acids.
Be careful with glutamine supplementation in liver and kidney disease and bipolar disorder.