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For calm focus without drowsiness
L-Theanine · An amino acid from green tea leaves (Camellia sinensis)
The green-tea amino acid that calms the brain without slowing it down.
Helps with
In plain language
A unique amino acid, found almost only in tea.
It crosses the blood-brain barrier (most amino acids cannot).
Within 30–60 minutes it increases alpha brain waves, the same state as in meditation (measured with EEG, a recording of brain activity).
Natural source:
L-Theanine is naturally found in green tea (Camellia sinensis) and some mushrooms. A cup of green tea contains about 20–30 mg. For a therapeutic dose you would need 6–10 cups. Our L-Theanine is 98% pure, extracted from tea leaves.
Why l-theanine is in Corti-Glow
Alpha waves = calm wakefulness. Not drowsiness, relaxed attention.
Balances the effect of caffeine during the day and calms the brain in the evening.
One of the few natural amino acids with a clinical effect on anxiety and sleep quality.
How it works on the body
Increases alpha brain waves
Within 30–60 minutes EEG shows more alpha activity, the state of calm concentration (like after meditation).
Increases GABA
L-Theanine boosts the production of GABA (gamma-aminobutyric acid), the main “calming” neurotransmitter in the brain.
Modulates glutamate
Glutamate is the main “excitatory” neurotransmitter. L-Theanine reduces its over-activity, thoughts stop “racing”.
Raises serotonin and dopamine
A mild increase in serotonin and dopamine, the “good” neurotransmitters for a stable mood.
What to expect
30–60 minutes · L-Theanine
You feel it from the first intake. A calmer mind, without drowsiness.
30–60 minutes
You feel it from the first intake. A calmer mind, without drowsiness.
First evening
It's easier to “switch off” before bed. Thoughts stop racing.
1 week
A more stable daytime mood, without sharp swings.
How it works with the other ingredients
Not just 7 supplements in one box. Every combination has a specific mechanism, here's why the formula is what it is.
Combination
+ Magnesium Bisglycinate · 670 mg
For sleep and muscle relaxation
Mechanism
A classic synergy: L-Theanine increases the production of GABA (the calm neurotransmitter). Magnesium opens the GABA channels, the receptors that have to “catch” GABA. Without magnesium, the increased GABA doesn't reach its target. Without L-Theanine, the opened channels have nothing to catch.
End benefit
A calm mind (L-Theanine) + a relaxed body (magnesium). Faster falling asleep, deeper sleep.
2 combinations · click to explore
This is why they aren't sold separately, one sachet, the full chain.
The research
Kimura et al. (2007)
Biological Psychology
Participants
12 healthy adults
Dosage
200 mg, single dose
Result: Significant increase in alpha brain waves (measured with EEG, a recording of brain activity) for 40–60 minutes. Reduction in the stress response to a demanding task.
Hidese et al. (2019)
Nutrients
Participants
30 adults
Dosage
200 mg daily, 4 weeks
Result: Significant reduction in anxiety, depression and sleep disturbances. Improvement in cognitive function.
Why this exact dose in Corti-Glow
See how our dose compares with what was used in clinical trials.
Corti-Glow, our dose
our dose, 200 mg
200 mg
Kimura 2007
200 mg, single dose
200 mg
Hidese 2019
200 mg daily, 4 weeks
200 mg
Frequently asked questions
Works well with
L-Theanine is one of the 7 ingredients.
Every evening, one sachet with the full formula, at clinical dose.
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