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Glutamine is one of the few amino acid supplements where the evidence for gut and immune support is grounded in clear physiological rationale rather than marketing. Pure Encapsulations earned its place here because of its clean, minimal formulation — a single active ingredient with no unnecessary additives. We recommend it for patients whose blood work or clinical picture suggests gut barrier compromise, those in demanding training, or anyone with elevated physiological stress.
About this product
L-Glutamine 850 mg
Pure Encapsulations L-Glutamine 850 mg is a free-form amino acid supplement providing glutamine — the most abundant amino acid in the body and a primary fuel source for the cells lining the gut wall. Glutamine is conditionally essential, meaning demand can outstrip the body's ability to produce it during periods of physiological stress, intense training, illness, or following gut disruption.
It is most commonly used to support intestinal barrier integrity, particularly by those with increased gut permeability, digestive complaints, or who are recovering from a course of antibiotics or a period of poor dietary intake. Athletes in heavy training blocks also reach for glutamine, as prolonged exercise is associated with a measurable drop in circulating levels.
Immune cells — especially lymphocytes and macrophages — rely on glutamine as a key substrate, so supplementing during periods of high demand may help maintain normal immune function alongside adequate dietary protein.
Pure Encapsulations is a brand with a longstanding commitment to clean formulation: minimal excipients, no unnecessary fillers, and a straightforward label. This SKU provides 850 mg of free-form L-glutamine per capsule, allowing flexible dosing. It suits those who want a simple, single-ingredient supplement without proprietary blends or added compounds. As with any amino acid supplement, results are most meaningful when dietary protein intake is otherwise adequate.
What it does
Benefits
- 01
Supports intestinal barrier integrity and gut lining health
- 02
May aid recovery during intense or prolonged training blocks
- 03
Helps maintain immune cell function under physiological stress
- 04
Conditionally essential amino acid for gut and immune cells
- 05
Single-ingredient formula for straightforward, flexible dosing
Get the most from it
How to use
Follow the dosage on the packaging. The existing guidance suggests 1–2 capsules daily; many practitioners advise taking glutamine away from large meals or first thing in the morning on an empty stomach, but consult your clinician if unsure about your specific protocol.
What's inside
Ingredients
View full ingredient list
L-Glutamine 850mg
Common questions
Frequently asked
Who is most likely to benefit from L-Glutamine supplementation?
Those most likely to benefit include people with gut permeability concerns, individuals in high-volume athletic training, anyone recovering from illness or antibiotic use, and those whose diet is temporarily low in dietary protein. Glutamine is conditionally essential, meaning demand rises significantly under physiological stress.
Can I take this alongside a protein supplement or with food?
Yes, L-glutamine is compatible with protein supplements — it is itself an amino acid. Some practitioners prefer it taken on an empty stomach to maximise absorption by gut epithelial cells, but taking it with a light meal is also reasonable. Check with your clinician if you have a specific therapeutic goal.
How long before I might notice a difference?
For gut-related goals, some people notice a gradual improvement in digestive comfort over several weeks of consistent use, particularly when combined with dietary changes. For immune or recovery support, effects are more subtle and best assessed alongside other markers. There is no universal timeline.
Is this suitable for people with kidney or liver conditions?
High-dose amino acid supplementation is generally approached cautiously in those with significant kidney or liver impairment, as these organs are involved in amino acid metabolism. If you have a known condition affecting either, speak to your GP or specialist before starting.
Why choose a free-form L-glutamine rather than getting it from food?
Dietary sources such as meat, fish, eggs, and dairy do provide glutamine, but the free-form supplement allows a targeted, measurable dose without additional macronutrients. This matters when dosing is being used therapeutically — for example, to support gut repair — rather than purely for general nutrition.
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