Glutamine
Amino acid that supports immune function, gut health, and brain function.
Research Summary
Glutamine is a conditionally essential amino acid used primarily to support gut health, immune function, and recovery in conditions like short bowel syndrome, surgery, or intense exercise, with typical supplemental doses of 5-10 grams per day for general use and up to 30 grams for specific medical needs.
Benefits
- Supports intestinal cell growth and barrier function, aiding gut health and nutrient absorption.
- Fuels immune cells, potentially reducing infections and shortening hospital stays post-surgery.
- May reduce muscle soreness and aid recovery after exercise by supporting protein synthesis.
- Helps in sickle cell disease by reducing red blood cell damage.
- Promotes faster burn healing and postsurgical recovery.
Recent Studies and Expert Research
- A 2020 Nutrients study supported high-dose tolerance up to 52 grams daily in athletes, with 5+ grams recommended for gut health.
- Mayo Clinic notes 30 grams daily (divided doses) for short bowel syndrome, up to 16 weeks.
- Examine.com and experts like Dr. Dominic D'Agostino recommend 5-10 grams for intestinal repair and reducing inflammation.
- A PMC case (2020) reported rare hepatotoxicity from glutamine powder, urging caution with excessive use.
- PubMed review (2008) found 20-30 grams acute intake safe in healthy adults.
Social Media Insights
No recent 2025 Reddit (/r/supplements) or forum discussions found in results; user experiences often note gut relief at 5-10 grams but emphasize starting low to avoid bloating (anecdotal, not expert opinion).
Natural Sources
Glutamine is abundant in protein-rich foods like beef, fish, eggs, dairy, beans, and spinach, providing 3-10 grams daily from a typical diet or up to 37+ grams for high-protein eaters like athletes. Natural intake is often sufficient for healthy individuals, making supplements unnecessary unless under stress, illness, or for therapeutic gut/immune support; you'd need pounds of meat daily to match high supplemental doses, so food complements but rarely replaces targeted supplementation.
Side Effects
- Common mild effects: bloating, nausea, stomach pain, heartburn, diarrhea, dizziness.
- Less common: headache, cough, back pain, constipation, swelling.
- Rare: hepatotoxicity (liver damage, one 2020 case), infections, fever.
- Generally safe up to 40 grams daily short-term; avoid excess in pregnancy/breastfeeding.