Supplementation

Glutamine: Does It Really Work? Updated Evidence 2026

Glutamine improves recovery, immunity and muscle gain? See what science shows in 2026 and who the supplement makes sense for.

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What is glutamine

Direct answer: Glutamine is the most abundant amino acid in the human body, representing around 60% of free amino acids in skeletal muscle.

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Main biological functions

In a normal state, these functions are supplied by endogenous production and food intake.

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What the evidence shows about hypertrophy

Compared glutamine vs placebo in strength training practitioners for 6 weeks. Result: no difference in strength or lean mass gains between groups.

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Where glutamine can make a difference

Studies in marathon runners and triathletes show that glutamine after very prolonged endurance exercise (>2h) attenuates immune suppression. Dose: 5 to 10 g post-exercise.

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Glutamine and intestine

Intestinal cells use glutamine as their preferred fuel. In conditions of intense stress (long run, training in heat, illness), the integrity of the intestinal barrier can be affected.

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Dose and protocol

Context Dose Timing --------- General fitness 5 g/dia Choice (pre or post-workout) High volume endurance 5–10 g Long post-workout Post-injury recovery 10 g/dia Divided into 2 outlets gastrointestinal clinic 10–30 g/di...

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Glutamine: Does It Really Work? Updated Evidence 2026

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