Overview
Primary fuel for enterocytes; supports tight junctions.
- Dietary protein from animal sources (meat, fish, eggs, dairy) and plant sources (soy, legumes, grains)
- Free-form amino acid powders and capsules
- Targeted pre-workout, recovery, or sleep formulations
- Free-form crystalline powder
- Capsules or tablets
- Pre-mixed recovery or hydration beverages
- Time-release formulations
Forms & variants of L-Glutamine
Different chemical forms of L-Glutamine behave differently. Browse each form's mechanism, bioavailability, and best-use context.
Mechanism of action
Enterocyte energy substrate; upregulates claudin-1 and occludin expression.
- · Enterocyte energy substrate
- · upregulates claudin-1
- · occludin expression
Effects on the body
Organ system effects
Evidence-based benefits
Reduces IBS symptoms post-infection
Moderate evidencePotential side effects
- · GI upset at high dose
Drug interactions
Supplement interactions
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
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Third-party testedIndependently verified L-Glutamine (Gut) — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.L-Glutamine (Gut) third party tested NSF
CapsulesPre-measured L-Glutamine (Gut) capsules — easiest for travel and consistent daily dosing without scoops or scales.L-Glutamine (Gut) capsules
PowderBulk unflavored L-Glutamine (Gut) powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.L-Glutamine (Gut) powder unflavored
Best sellersMost-purchased L-Glutamine (Gut) products on Amazon — a quick way to see what's reviewed widely before you commit.L-Glutamine (Gut) best sellerScientific evidence8Show studiesHide studies
Glutamine in post-infectious IBS
Zhou Q, et al.
8-week DB-RCT in 106 PI-IBS patients.
5 g tid significantly improved IBS severity score vs placebo.
PubMed: L-Glutamine (Gut) — Reduces IBS symptoms post-infection
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Google Scholar: L-Glutamine (Gut) — clinical evidence
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