L-Glutamine Boost - Amino Acid Powder

L-glutamine is the most abundant amino acid in the human body by concentration — and also the one most rapidly depleted under stress. Physical training, illness, surgery, gut dysbiosis, and psychological stress all draw down glutamine reserves faster than diet can typically replace them. The result is a dual compromise: slower muscle recovery and impaired gut lining integrity. L-Glutamine Boost delivers 5g of pharmaceutical-grade glutamine per serving in an unflavoured powder that mixes into anything and works across both the athletic and gut health applications simultaneously.

Two Problems, One Amino Acid

The muscle recovery application: During intense exercise, glutamine is released from muscle cells at a rate that outpaces synthesis. Post-exercise glutamine supplementation supports protein synthesis, reduces muscle soreness indicators, and provides nitrogen to the muscle repair process. For athletes training 4+ days per week, glutamine depletion from training accumulates faster than passive dietary repletion can manage.

The gut health application: Enterocytes — the cells lining the small intestine — use glutamine as their primary fuel source, consuming more glutamine than any other amino acid. The gut lining turns over every 3–5 days; this regeneration requires a constant glutamine supply. When glutamine availability drops (illness, antibiotics, chronic stress, inflammatory bowel conditions), gut lining integrity suffers. Research published in Clinical Nutrition confirms glutamine supplementation significantly improves intestinal barrier function and reduces gut permeability — the mechanism behind "leaky gut" that links gut health to broader inflammation and immune function.

Why Competitors Fall Short

MyProtein L-Glutamine — not halal, may contain cross-contamination. MyProtein's glutamine is a clean product at a competitive price but carries no halal certification and is manufactured in facilities handling multiple allergens. For buyers requiring halal compliance, L-Glutamine Boost is certified throughout.

Bulk Pure L-Glutamine — not halal. Bulk's glutamine is unflavoured and competitively priced but carries no halal certification.

Most glutamine supplements — marketed only to athletes. L-glutamine's most significant commercial market is sports nutrition — but the gut health application is at least as important for a different buyer group. L-Glutamine Boost is positioned for both, which is why it's crosslisted in the gut health range alongside the workout range.

What's in Every Serving

• L-Glutamine — 5g per 5g serving · 100% pure · pharmaceutical grade · unflavoured · free-form (not peptide-bonded — for fastest absorption)
• Purity · no fillers · no flow agents · no added ingredients · single-ingredient formula

100g per pouch — 20 servings at 5g per serving. Vegan. Halal approved. Kosher. Gluten-free. Unflavoured.

Every serving is:  ✓ Halal approved  ·  ✓ Kosher  ·  ✓ Vegan  ·  ✓ Gluten-free  ·  ✓ Unflavoured  ·  ✓ Single ingredient  ·  ✓ UK GMP made

L-Glutamine Boost vs the Competition

Based on publicly available product information. Prices approximate. Always verify current specs on manufacturer websites.

How to Take It

For muscle recovery: Mix 5g (1 level scoop) into your Post-Workout shake immediately after training. The post-exercise window (within 60 minutes) is when glutamine demand is highest and repletion is most effective.

For gut health: Mix 5g into water on an empty stomach, morning and/or night. Taking away from food maximises availability to enterocytes as the primary fuel source. For gut lining support protocols, consistent daily use over 4–8 weeks produces the most meaningful outcomes. Pair with BioTic 4 Billion for a combined gut lining and microbiome approach.

Is This You?

• You train 4–6 days per week and want to support recovery by replenishing the amino acid most rapidly depleted by exercise
• You have gut permeability concerns, IBS, or post-antibiotic gut disruption and want the most evidence-backed gut lining amino acid
• You need a halal certified L-glutamine powder — MyProtein and Bulk aren't halal certified
• You want pure, unflavoured glutamine that mixes into shakes, soups, or water without affecting flavour

Explore the full Gut Health UK and Workout Range collections.

Questions We Get Asked

Food supplements should not replace a varied diet or healthy lifestyle. Consult your GP before use if pregnant, breastfeeding, managing a kidney condition, or taking immunosuppressant medication.