Glutamine — an amino acid that plays an important role in metabolism, immune system function, and maintaining gut health.
It is present in high concentrations in muscle tissue, providing energy to cells and participating in the regulation of acid-base balance.
Under normal conditions, the body synthesizes glutamine on its own; however, during stress, intense physical exertion, or illness, the need for it increases.
Beneficial Properties
- supports the immune system by participating in the synthesis of antibodies and immune cells;
- provides energy to intestinal cells, contributing to mucosal health and barrier function;
- promotes the recovery of muscle tissue and prevents catabolism;
- participates in the regulation of the body’s acid-base balance;
- affects the synthesis of neurotransmitters, influencing cognitive and psycho-emotional states.
Daily Requirement and Sources
The recommended daily dose of glutamine is between 5 to 10 g. During intense physical exertion, stress, or recovery from injuries, it may increase to 20–30 g per day.
Main sources of glutamine:
- meat: beef, chicken, turkey;
- fish and seafood;
- eggs and dairy products;
- legumes: beans, soy, chickpeas;
- cabbage, spinach, parsley.
Possible forms and their learnability
Nutrient forms are listed from best to worst:
Symptoms and Consequences of Deficiency
- weakened immunity, increased frequency of colds and infections;
- increased intestinal permeability, inflammation, and food intolerances;
- slow recovery after workouts, muscle weakness, and fatigue;
- anxiety, mood deterioration, reduced concentration;
- slowed metabolism and worsened overall well-being.
Possible Risks of Excess and Their Manifestations
- digestive disorders — bloating, diarrhea, nausea;
- headaches, irritability, anxiety;
- amino acid imbalance, reduced absorption of glycine and arginine;
- increased load on the liver and kidneys, especially in case of diseases of these organs;
- increased blood ammonia levels when taking high doses without medical supervision.
Excessive consumption of glutamine (over 30 g/day) is not recommended without specialist supervision.
Gut, immunity and stress
Glutamine fuels intestinal and immune cells, participates in nitrogen transport and helps maintain acid-base balance. This is why it is often discussed during recovery, heavy training and gut barrier stress.
Glutamine is not a universal gut treatment. Bloating, pain, diarrhea, blood, weight loss or suspected inflammatory bowel disease require evaluation rather than only an amino acid supplement.
Keto and protein balance
On keto, glutamine usually comes from meat, fish, eggs, poultry, dairy and collagen-rich foods. With adequate protein intake, isolated supplementation is often unnecessary.
Caution is needed in severe liver or kidney disease, cancer and complex metabolic conditions. In sports, glutamine does not replace complete protein, sleep, carbohydrate strategy when appropriate and well-planned training.