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Glutamine Side Effects & Safety

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

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Very well tolerated — one of the safest amino acid supplements even at high doses
  • Rare GI symptoms (bloating, constipation) at very high single doses
  • Theoretical concern: high-dose glutamine in cancer patients (as a tumor fuel source) — consult oncologist

Drug & Supplement Interactions

  • Lactulose — glutamine may reduce the efficacy of lactulose for hepatic encephalopathy by providing additional nitrogen
  • Anti-seizure medications — glutamine can be converted to glutamate; theoretical interaction (clinically insignificant at normal doses)
  • Chemotherapy — consult oncologist; glutamine may protect against mucositis but theoretical concern about tumor fuel

Maximum Dose

Do not exceed: 30 g/day in divided doses; well tolerated even at high doses in clinical settings

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