L-Theanine
An amino acid found primarily in green tea that promotes relaxation without sedation. Increases alpha brain waves, enhances focus when paired with caffeine, and improves sleep quality. Core component of Huberman's sleep protocol.
How L-Theanine Works
L-theanine crosses the blood-brain barrier and increases GABA, serotonin, and dopamine levels while promoting alpha wave production in the brain. It modulates glutamate release, producing anxiolytic effects without sedation.
📊 Evidence by Outcome
Increases alpha brain wave activity within 30-45 minutes, producing a calm, focused state without drowsiness.
12 studies • Consistency: High • Effect: Moderate
L-theanine + caffeine is one of the most studied nootropic stacks. Improves attention, accuracy, and task-switching while reducing caffeine jitteriness.
15 studies • Consistency: High • Effect: Moderate
Improves sleep quality in anxiety-prone individuals. Does not induce drowsiness but eases transition to sleep.
8 studies • Consistency: Moderate • Effect: Small-Moderate
Key Research
Peer-Reviewed Evidence • 1 Citations
The effects of L-theanine, caffeine and their combination on cognition and mood
Owen GN et al.•Nutritional Neuroscience•2008•PMID: 18681988
Key Finding: L-theanine + caffeine combination improved speed and accuracy of attention tasks and reduced susceptibility to distracting information.
View on PubMedCitations sourced from PubMed, Cochrane Library, and peer-reviewed journals. Study findings are summarized for accessibility. Always consult the original publication for full methodology and results.
📋 Protocol Snapshot
Protocols are for informational purposes only. Always consult a qualified healthcare provider before starting any treatment protocol.
Cost Guide
AED 30-80/month
Estimated UAE pricing. Costs vary by provider, dosage, and treatment plan.
Where to Get It (UAE)
Related Treatments
Medical Disclaimer: The information on this page is for educational purposes only and is not intended as medical advice. Kamura Scores reflect a combination of research evidence, community data, and other factors — they are not clinical recommendations. Research citations are provided for reference; always consult the original publications for complete study details. Consult a qualified healthcare provider before starting, stopping, or modifying any treatment. Individual results may vary.