For calm focus without drowsiness
L-Theanine
L-Theanine · An amino acid from green tea leaves (Camellia sinensis)
The green-tea amino acid. 200 mg per sachet — the dose used in clinical studies on calm focus.
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In plain language
What it does in your body
A unique amino acid, found almost only in tea.
It crosses the blood-brain barrier (most amino acids cannot).
An amino acid found in nature almost only in tea leaves (Camellia sinensis). That makes it rare in food: 200 mg is more tea than anyone drinks in an evening.
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
Why this ingredient specifically, not an alternative.
Alpha waves = calm wakefulness. Not drowsiness, relaxed attention.
Pairs with caffeine during the day and is among the well-studied amino acids for a calm evening.
One of the few natural amino acids studied in clinical trials for anxiety and sleep quality.
How it works on the body
Mechanism, step by step.
1Alpha brain waves
The sachet carries 200 mg. An isolated amino acid rather than a tea extract, which means without the caffeine and the tannins that come with the leaves.
2GABA — the calm
GABA (gamma-aminobutyric acid) is the main calming neurotransmitter in the brain — the “brake” that in the evening helps thoughts stop racing.
3Glutamate — the excitation
Glutamate is the main “excitatory” neurotransmitter. When there is too much of it in the evening, thoughts “race”.
4Serotonin and dopamine
Serotonin and dopamine are the neurotransmitters of a stable mood.
How it works with the other ingredients
7 ingredients. Each pair with a specific mechanism.
Not random supplements in one box. Every combination has a biological reason.
Combination
L-Theanine + Magnesium
+ Magnesium Bisglycinate · 670 mg
For sleep and muscle relaxation
Mechanism
The two travel together in the evening dose: 200 mg of L-theanine and 670 mg of magnesium bisglycinate. Magnesium contributes to normal nervous system function.
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.
Why this exact dose in Corti-Glow
200 mg, specific, not random.
- →200 mg per sachet, printed as its own line on the box rather than pooled with the other ingredients.
- →98% purity guarantees that this is the real effective dose, not 200 mg of a mix with other ingredients.
Frequently asked questions
About l-theanine.
Does it put me to sleep like a sedative?+
Is there dependence?+
Why 200 mg?+
Works well with
The other ingredients in Corti-Glow.
For sleep and muscle relaxation
Magnesium Bisglycinate
670 mgMagnesium contributes to normal nervous system and muscle function. The bisglycinate form is chosen as gentler on the stomach than the oxide.
See detailsFor stress and cortisol
Ashwagandha
300 mgRoot extract of Withania somnifera, 300 mg per sachet. From the root only, not the leaves.
See detailsThe evening can be different.
Magnesium, ashwagandha and collagen are in stock today. Our own Corti-Glow sachet is still in production.
See what is in stock