Nootropic profile
L-Glutamine
L-Glutamine is the most abundant amino acid in the body and a precursor to both glutamate (the primary excitatory neurotransmitter) and GABA (the primary inhibitory neurotransmitter). It supports cognitive function, gut-brain axis health, and mental clarity during periods of stress or intense physical activity.
Best for
Educational only: this is not medical advice. Always check with a qualified healthcare professional before starting any supplement.
What is L-Glutamine?
L-Glutamine is a conditionally essential amino acid, meaning the body can produce it under normal conditions but demand may outstrip supply during illness, intense exercise, or periods of high stress.
What it does for you
Community and editorial ratings, out of 5:
How to take it
- Typical dose: 2-5 g per day for general cognitive support
- For gut health: 5-10 g per day, often split into 2-3 doses
- Athletic recovery: 5-15 g per day around training sessions
- For mental clarity: 2-3 g taken in the morning or before mentally demanding tasks
- Upper limit: Generally considered safe up to 20 g per day in healthy adults, though most people benefit from 5-10 g
Watch out for
- Side effects: Generally very well tolerated. Occasional reports of mild gastrointestinal discomfort, bloating, or nausea at high doses.
- Liver conditions: Those with severe liver disease (hepatic encephalopathy) should avoid glutamine supplementation as impaired ammonia metabolism may worsen...
- Seizure disorders: Because glutamine can increase glutamate levels, individuals with epilepsy or seizure disorders should consult a doctor before supplementing.
- Cancer considerations: Some rapidly dividing cells use glutamine as fuel. Those with cancer should consult their oncologist before supplementing.
- Pregnancy: Generally considered safe at dietary levels, but supplemental doses should be discussed with a healthcare provider.
The science, if you're curious.
- L-Glutamine is converted to glutamate by glutaminase in neurons, then recycled back to glutamine by glutamine synthetase in astrocytes. This cycle is...
- Through its conversion to glutamate and subsequent decarboxylation by glutamic acid decarboxylase (GAD), L-Glutamine indirectly supports GABA synthesis,...
- When glucose availability is low, glutamine can serve as an alternative energy substrate for neurons and glial cells, helping maintain cognitive function...
- As the primary fuel for intestinal epithelial cells, glutamine maintains gut barrier integrity, reducing systemic inflammation that can impair cognitive...
Where to find it
- Beef and poultry: Excellent sources, providing significant glutamine per serving
- Fish: Particularly high in glutamine, especially saltwater species
- Eggs: A good bioavailable source of glutamine
- Dairy products: Milk, yoghurt, and cheese contain moderate amounts
- Cabbage and spinach: Among the best plant sources of glutamine
- Supplements: Available as L-Glutamine powder, capsules, and in combined amino acid formulas. Free-form powder is the most popular and cost-effective option.
Frequently asked
L-Glutamine is the most abundant amino acid in the body and a precursor to both glutamate (the primary excitatory neurotransmitter) and GABA (the primary inhibitory neurotransmitter). It supports cognitive function, gut-brain axis health, and mental clarity during periods of stress or intense physical activity.
The main benefits people report from L-Glutamine are: Cognitive Enhancement, Energy, Focus, Memory, Mood, Stress Relief.
Typical dose: 2-5 g per day for general cognitive supportFor gut health: 5-10 g per day, often split into 2-3 dosesAthletic recovery: 5-15 g per day around training sessionsFor mental clarity: 2-3 g taken in the morning or before mentally demanding tasksUpper limit: Generally considered safe up to 2...
Side effects: Generally very well tolerated. Occasional reports of mild gastrointestinal discomfort, bloating, or nausea at high doses.Liver conditions: Those with severe liver disease (hepatic encephalopathy) should avoid glutamine supplementation as impaired ammonia metabolism may worsen...Seizure...
L-Glutamine is converted to glutamate by glutaminase in neurons, then recycled back to glutamine by glutamine synthetase in astrocytes. This cycle is...Through its conversion to glutamate and subsequent decarboxylation by glutamic acid decarboxylase (GAD), L-Glutamine indirectly supports GABA synthe...
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