L-Theanine

Overview

L-theanine is a unique amino acid found primarily in tea leaves, particularly green tea. It promotes a state of calm alertness by increasing alpha brain waves, which are associated with relaxed but focused mental states. L-theanine supports stress response modulation and contributes to HPA axis buffering, helping the body manage stress more effectively. It also supports GABAergic tone and neurotransmitter balance, making it useful for promoting relaxation and supporting sleep preparation when combined with other calming nutrients.

Recipes

1 recipe containing this substance

Matcha Mitochondria Smoothie

Mitochondrial energising smoothie rich in polyphenols, magnesium, and antioxidants

Foods

1 food containing this substance

Green Tea

Source of EGCG, L-theanine, and polyphenols for cognitive and metabolic support

Biological Mechanisms and Implications

Biological Target	Therapeutic Areas	Mechanism of Action
Metabolic & Neuroendocrine Stress (HPA Axis & ANS)	ADHD, Anxiety & GAD, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base	Increases alpha waves and promotes calm without sedation; supports relaxation
Neurotransmitter Regulation	ADHD, Alzheimer's Disease, Anxiety & GAD, Bipolar Disorder, Depression & MDD, Postnatal Depression (PND / PPD) — Evidence Base	Supports GABAergic tone and neurotransmitter balance

References

• L-theanine found in green tea increases alpha waves and calms without sedation; supports evening wind-down and sleep preparation when combined with tryptophan, complex carbs, magnesium, and herbal teas
• L-theanine synergizes with magnesium and tryptophan strategies for circadian alignment and supports GABAergic tone and neurotransmitter balance