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Glutamine — Frequently Asked Questions

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Frequently Asked Questions

Does glutamine build muscle?

No. Despite its popularity in bodybuilding, glutamine supplementation does not increase muscle protein synthesis or strength gains in healthy individuals consuming adequate protein. A 2001 RCT by Candow et al. found no benefit of glutamine (0.9 g/kg/day) over placebo for lean mass or strength during resistance training. Save your money for protein and creatine.

When is glutamine actually useful?

Glutamine has genuine benefits in three contexts: (1) immune support during heavy endurance training blocks (marathon training, overreaching phases), (2) gut health — it is the primary fuel for intestinal cells and may help with leaky gut or exercise-induced GI symptoms, and (3) clinical settings (post-surgery, critical illness, burns) where demand dramatically exceeds supply.

How much glutamine do I get from protein foods?

A typical high-protein diet provides 3-6 g of glutamine per day from foods like meat, dairy, eggs, and legumes. Whey protein is particularly rich in glutamine (~8% by weight). If you consume 100 g of whey protein, you are already getting ~8 g of glutamine. This is why additional supplementation is unnecessary for most athletes eating adequate protein.

Full Glutamine Guide

References

  1. (). Does glutamine have a role in reducing infections in athletes?. European Journal of Applied Physiology. DOI
  2. (). Effect of glutamine supplementation combined with resistance training in young adults. European Journal of Applied Physiology. DOI
  3. (). Glutamine supplementation in serious illness: a systematic review of the evidence. Critical Care Medicine. DOI