L-Theanine

🌿 ARTICLE 1


L-theanine: the concentrated serenity of green tea


Naturally present in green tea leaves (Camellia sinensis), L-theanine is an amino acid known for its gentle action on mental balance.


Unlike sedatives, L-theanine does not cause sudden drowsiness or a feeling of lethargy. Rather, it acts as a subtle regulator of mental state, promoting a sense of clear calm.


It is particularly popular:

  • 🌙 To accompany relaxation at the end of the day

  • 🧠 To promote relaxation without loss of alertness

  • 😌 To support emotional balance during times of stress

  • ⚖️ To create a state conducive to mental calm


L-theanine is often described as a “lucid calm”:

The mind slows down, but remains clear.


In an evening routine, it can help facilitate the transition between a stimulating day and a moment of natural relaxation.

🔬 ARTICLE 2


L-theanine: scientific data and physiological mechanisms


L-theanine (γ-glutamylethylamide) is a non-proteinogenic amino acid primarily found in green tea.


🧠 1. Effects on brain activity


Studies have shown that L-theanine increases alpha wave activity in the brain, which is associated with a state of wakeful relaxation.


📚 Reference:

Juneja LR et al. (1999). L-theanine—a unique amino acid of green tea and its relaxation effect in humans . Trends in Food Science & Technology.

😌 2. Stress and physiological response


L-theanine appears to modulate the stress response by influencing:

  • Cortisol production

  • The activity of the autonomic nervous system

  • The balance between excitatory and inhibitory neurotransmitters


Some studies have observed a reduction in subjective stress markers after supplementation.


📚 Reference:

Kimura K. et al. (2007). L-Theanine reduces psychological and physiological stress responses . Biological Psychology.

🌙 3. L-theanine and sleep quality


L-theanine does not produce a direct hypnotic effect.

However, by promoting mental relaxation, it can help improve the subjective quality of sleep, particularly in people with mild stress.


📚 Reference:

Hidese S. et al. (2019). Effects of L-theanine administration on stress-related symptoms and cognitive functions . Nutrients.

🧬 4. Mechanism of action


L-theanine crosses the blood-brain barrier and acts in particular on:

  • The GABA system

  • Dopamine

  • Serotonin

  • Glutamate receptors

It thus contributes to a neurochemical rebalancing associated with a state of relaxation.

Conclusion: A natural and well-documented approach to regaining more peaceful nights

In a daily life marked by stress and mental overload , it becomes essential to adopt solutions that respect the body's balance. Thanks to the combination of plants traditionally used for relaxation and micronutrients studied for their role in nervous system balance, Nubia embodies an approach that is both natural and informed by science .

Click here to discover how to integrate Nubia into your evening routine and accompany your nights towards more calm and regularity.

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