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Glutamine – Regeneration and Immune System
What is Glutamine?
Glutamine (L-Glutamine) is the most abundant free amino acid in the blood and muscles – it makes up to 60% of all free amino acids in blood plasma. Although the body can synthesize glutamine itself (hence it is not strictly essential), sports nutrition research classifies it as conditionally essential: during times of intense physical exertion, injury, or illness, the body's own production may not meet demand.
Functions of Glutamine in the Body
Gut Health and Gut Barrier
Glutamine is the preferred fuel for enterocytes – the cells lining the intestinal mucosa. It maintains gut barrier function and prevents "Leaky Gut Syndrome" (increased intestinal permeability). Clinically, glutamine is used in critically ill patients and after intestinal surgeries to maintain gut enterocyte function.
Immune System
Immune cells (T-lymphocytes, macrophages, neutrophils) consume glutamine as a primary energy source for rapid cell division. After intense exercise, plasma glutamine levels drop by 20–40%, temporarily weakening the immune system – the so-called "open window" for infections after endurance exercise.
Gluconeogenesis and Glycogen Stores
Glutamine can be converted to glucose in the liver (gluconeogenesis) and contributes to replenishing glycogen stores after exercise – especially relevant for low-carbohydrate diets.
Muscle Protein Synthesis
Glutamine itself is not a strong MPS trigger (that's leucine's job). However, it keeps anabolic signaling pathways active through cell volumization and prevents protein degradation by optimizing intracellular pH.
When is Glutamine Supplementation Useful?
| Situation | Benefit | Recommendation |
|---|---|---|
| High-volume endurance sports (>10h/week) | ⭐⭐⭐⭐ Immune protection | Useful |
| Strength training + sufficient protein | ⭐⭐ Limited | Conditionally useful |
| Calorie deficit/diet | ⭐⭐⭐ Muscle protection | Useful |
| Intestinal problems/Leaky Gut | ⭐⭐⭐⭐⭐ Very useful | Strongly recommended |
| After training with normal protein intake | ⭐ Minimal | Not necessary |
Dosage
| Purpose | Dose | Timing |
|---|---|---|
| General supplementation | 5 g | Post-workout or before bed |
| Immune protection for endurance sports | 10 g | Immediately after training |
| Gut health | 5–10 g | Fasting in the morning or before bed |
| Periods of high stress | 15–20 g/day | Divided into 3–4 portions |
Study Situation
The evidence for glutamine in muscle building in the context of normal protein intake is weak. The evidence for gut health and immune function during high training loads is more moderate. Clinically, glutamine is well-documented for trauma and after surgery.
Frequently Asked Questions (FAQ)
Does glutamine prevent muscle breakdown when losing weight?
Limited – the strongest anti-catabolic effects come from sufficient total protein (2.0–2.4 g/kg) and leucine. Glutamine can help complementarily but is not a substitute for a protein-rich diet.
Related Terms
BCAA · EAA · Whey Protein · Vitamin C · Zinc
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