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Also known as: γ-Glutamylethylamide, Suntheanine
An amino acid found in green tea that promotes calm focus by increasing alpha brain waves, GABA, and serotonin — the perfect complement to caffeine.
L-Theanine is an amino acid found almost exclusively in Camellia sinensis (tea plant). It crosses the blood-brain barrier within 30 minutes and promotes a state of calm alertness — the reason tea feels different from coffee despite containing caffeine.
The most researched nootropic combination in existence. 200mg L-Theanine + 100mg caffeine consistently improves attention, task-switching, and reduces error rates across dozens of studies. This is the recommended starting point for nootropic beginners.
Higher doses (400-600mg) produce more pronounced anxiolytic effects and can be used as a standalone anti-anxiety agent without cognitive impairment.
L-Theanine increases GABA, serotonin, and dopamine levels in the brain. It blocks glutamate binding to AMPA receptors (reducing excitotoxicity) and increases alpha brain wave production in the posterior temporal and occipital regions — the neural signature of relaxed alertness.
Typical Dose
100-400mg
Frequency
Daily (1-3 doses)
Cycle Length
Ongoing (no cycling needed)
Half-Life
~3 hours
Extensively studied. FDA GRAS status. Hundreds of clinical trials. One of the most well-researched natural nootropics.
Exceptionally safe. FDA GRAS status. No known adverse effects at recommended doses. No tolerance, dependence, or withdrawal. Safe to combine with most medications. May potentiate sedative effects of some drugs.
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