What does glutamine actually do?

Glutamine is a "conditional" amino acid. Your body makes it, and in normal health you need no extra. It is used by fast-dividing cells, including immune cells and the cells lining the gut, and it carries nitrogen between tissues. In hospital settings, supervised glutamine feeding has a role under medical care. That is a different situation from a healthy athlete taking a scoop of powder.

Does glutamine help athletes?

A 2019 systematic review and meta-analysis in Clinical Nutrition (Ramezani Ahmadi et al.) found no significant effect of glutamine supplements on immune function, aerobic performance or body composition in athletes. In plain terms:

• Muscle growth and recovery: not shown to help in healthy lifters who eat enough protein.
• Immunity and colds: not shown to protect athletes from illness.
• Gut in the heat: early studies in hot conditions used large doses scaled to body mass, well above a 5 g retail scoop. It is experimental, not a recommendation.

Glutamine is also in food. Whey and other proteins contain several grams of glutamine and glutamate per 100 g of protein, so a normal protein intake covers most needs.

Who might still consider it?

Possibly an endurance athlete with repeated gut symptoms in hot races, such as a summer Comrades build-up, working with a sports dietitian. First-line steps are fuelling practice, hydration and heat acclimation. If you want a trial, treat it as an experiment with your dietitian, not a performance upgrade.

What does glutamine cost in South Africa?

As of October 2026, plain L-glutamine runs from R2.68 per 5 g (Nutritech 300 g, R160.95–R168 at Wellness Warehouse and Clicks) to R7.50 per 5 g (ATP Fitness L-Glutamine 200 g, R300 at the ATP shop). ATP's powder is a single ingredient with no sweeteners, but it is the dearest per dose, and its serving size and any third-party testing are not published. The Nutritech tub is the cheaper alternative. Full prices are in glutamine cost per serving and best glutamine in South Africa.

Is glutamine safe?

It is well tolerated at common doses in healthy adults. Speak to a doctor first if you have liver disease (especially a risk of hepatic encephalopathy), certain cancers, or take anticonvulsant medication. Do not give it to children or teenagers, or use it in pregnancy or while breastfeeding, without medical advice. Drug-tested athletes should use batch-tested products, since no brand we checked shows a verified certificate. See how much glutamine per day for dosing.

What should you use instead?

Total daily protein, adequate carbohydrate and sleep matter far more. Creatine, caffeine and beta-alanine have far stronger evidence; see which supplements actually work.

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