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Glutamine

Overview

Glutamine is an amino acid in food protein. The body also makes it, and systemic pools supply the gut. Under physiological stress it can become conditionally indispensable. This page keeps that amino acid separate from glutamine powder used as a supplement.

Glutamine is an enterocyte fuel and a substrate for epithelial proliferation, repair, and tight-junction proteins [1]. Across adult trials, glutamine supplementation did not improve gut permeability overall [2]. A separate trial in postinfectious irritable bowel syndrome reported a selected supplementation response [3]. That result stays in that condition. It does not make dietary protein, or extra glutamine, a general requirement for barrier integrity [2,3].

Dietary Origin

Foods supply glutamine inside protein. Endogenous synthesis and circulating glutamine also supply the intestine, so a food that contains protein is not evidence that the meal raised barrier proteins [1]. The permeability trials and the postinfectious IBS trial gave glutamine as a supplement [2,3]. No food page here has a verified glutamine amount, so none is linked.

Research Spotlights & Evidence Checks

🔎 Evidence Check · supplemental-formulation

Does glutamine supplementation tighten the gut barrier in adults?

Adult trials as a group do not show a permeability benefit. A postinfectious IBS trial is a separate, selected response [2,3].

Read the evidence

A systematic review of adult clinical trials found no overall improvement in gut permeability with glutamine supplementation [2]. The epithelial case for glutamine is substrate use in proliferation, repair, and tight-junction protein maintenance, much of it from experimental models [1]. The postinfectious IBS trial supports a response in that selected group only [3]. Neither result is a protein-serving effect.

Recipes

no recipes found (no foods contain this substance)

Foods

no foods found

Biological Regulatory Systems

Biological Regulatory System	Evidence-qualified relationship	Evidence
Gut-Brain Axis & Enteric Nervous System (BRS5)	Glutamine is an enterocyte substrate in gut-barrier tight-junction integrity. Adult supplementation shows no overall permeability benefit. A postinfectious IBS response does not establish general need.	[1,2,3]

References

[1] Rao and Samak (2012). Role of glutamine in protection of intestinal epithelial tight junctions. Reviews glutamine as an enterocyte substrate for proliferation, repair, and tight-junction protein maintenance. Experimental and mechanistic literature, not a food trial.

[2] Abbasi et al. (2024). A systematic review and meta-analysis of clinical trials on the effects of glutamine supplementation on gut permeability in adults. Adult supplementation trials do not show an overall permeability benefit. This is supplement evidence, not ordinary protein intake.

[3] Zhou et al. (2019). Randomised placebo-controlled trial of dietary glutamine supplements for postinfectious irritable bowel syndrome. A selected postinfectious IBS supplementation response. It does not establish glutamine as a general barrier requirement.