Glutamine is one of the 20 amino acids that humans need to build their own proteins. It is a non-essential amino acid that the body produces from glutamic acid . It is found both in our food and in the form of dietary supplements such as powders or capsules. Glutamine is involved in many biological processes and is particularly important for the health of our cells. It supports metabolism, promotes regeneration, and strengthens our immune system. Learn everything you need to know about glutamine, its functions, and optimal intake.
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The Properties and Benefits of Glutamine
Glutamine is one of the most important amino acids for our body. It plays a central role in maintaining and regenerating the intestinal lining. A healthy intestinal lining is essential for optimal digestion and a strong immune system. Our body can produce glutamine in sufficient quantities, mainly in the muscles. Various factors, such as illness or intense physical activity, can cause a deficiency while simultaneously increasing demand. Supplementing with glutamine can help meet this "new" requirement.
Difference Between Glutamine and Glutamate
Glutamine and glutamate are related but distinct amino acids. Glutamine is a non-essential amino acid that serves multiple functions in the body, especially for regenerating the intestinal lining and supporting the immune system. Glutamate, on the other hand, is an essential amino acid and primarily functions as a neurotransmitter in the brain, involved in signal transmission. While glutamine is mainly important for general health and regeneration, glutamate plays a central role in brain function and nervous system communication.
The Effect of Glutamine on the Intestinal Lining and Immune System
Glutamine is the primary energy source for cell division in the stomach and intestines, supporting the gut’s barrier function. The intestinal lining is crucial not only for nutrient absorption but also for defense against harmful substances and pathogens. Approximately 40% of all glutamine metabolized in the human body is used in the gut.
The intestinal lining plays a critical role in nutrient absorption and protection against pathogens. Glutamine significantly contributes to regenerating and maintaining this essential barrier. Adequate glutamine intake can help reduce intestinal inflammation and preserve the integrity of the gut lining, which is particularly important for people with chronic gastrointestinal conditions or after surgery.
Glutamine is also vital for the immune system, serving as an energy source for immune cells and supporting their function. A strong immune system is essential for protecting the body against infections and diseases. By taking glutamine, you can strengthen your immune system and improve overall health.
Factors That Can Lead to Glutamine Deficiency
Glutamine requirements can increase in certain stressful situations, such as:
- Chronic gastrointestinal infections
- Medication therapies (e.g., chemotherapy)
- Intense athletic training
Even after an infection subsides, deficiency may persist due to increased intestinal permeability, allowing allergens and pathogens to pass more easily. This often results in symptoms such as pain and diarrhea.
In addition to medical conditions, athletes also require more glutamine through diet or supplementation. For those who train regularly and intensely, glutamine can be particularly beneficial. It promotes muscle regeneration, reduces recovery time, supports muscle building, and can enhance athletic performance. Adequate glutamine intake is therefore essential for athletes.
Glutamine in the Diet
In certain situations, such as intense training or illness, additional glutamine supplementation may be useful. Glutamine naturally occurs in many protein-rich foods. Good sources include:
- Meat
- Fish
- Eggs
- Dairy products
Plant-based foods such as legumes and nuts also contain glutamine. As a general rule, protein-rich plant and animal foods like soybeans and soy products, wheat and oats, legumes, meat and meat products, sea fish, milk, and dairy products are good sources of glutamine.
L-Glutamine in Supplements
L-Glutamine, the bioactive form of glutamine in the body, is available as powder or capsules. It is well absorbed and can replenish the body’s glutamine reserves when needed. When choosing a product, quality and purity are important. Supplements from trusted sources ensure safe and effective support of your diet.
Dosage Recommendations
The dosage of L-glutamine depends on factors such as age, health status, and physical activity. Generally, a daily intake of 5 to 15 grams is recommended. Higher doses should be taken in consultation with a doctor or nutritionist. Glutamine can be taken in the morning, before, or after training, depending on individual needs.
Possible Side Effects and Safety
Glutamine is generally considered safe and well-tolerated. In rare cases, side effects such as gastrointestinal discomfort may occur. When taken properly, no serious side effects are expected. If you have health concerns or chronic conditions, consult your doctor before taking glutamine.
Glutamine and Gut Health
Glutamine is particularly important for a healthy intestinal lining, stable gut microbiota, and a strong immune system. Long-term supplementation with glutamine combined with probiotics can be supportive. In any case, glutamine supplementation should be discussed with a healthcare professional.
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Source:
E. Fütterer, HAW Hamburg, 2019: Glutamine as a nutritional therapy measure to improve leaky gut syndrome; online at: https://reposit.haw-hamburg.de/bitstream/20.500.12738/8618/1/BA_Leakygut_Fuetterer.pdf
