L-Theanine 250mg | Relaxation Without Drowsiness | Stress Support | 300 Vcaps

L-Theanine (γ-glutamylethylamide) is a naturally occurring non-protein amino acid found almost exclusively in the leaves ofCamellia sinensis the tea plant. It is the compound responsible for the calm, focused quality of green tea that distinguishes it from other caffeinated beverages. Licensed by Health Canada (NPN 80068090) to help temporarily promote relaxation without drowsiness, help reduce stress, and help support cognitive function. Each capsule provides 250mg of L-Theanine from green tea leaf equivalent to approximately 5–12 cups of brewed green tea, without caffeine.

L-Theanine's primary neurological mechanism is the promotion of alpha brain wave activity (8–13 Hz) the wave pattern associated with relaxed, wakeful alertness: calm but mentally present, without tension or sedation. Multiple EEG studies have demonstrated that L-Theanine increases alpha wave activity in the occipital and parietal regions within 30–60 minutes of ingestion. Most relaxation compounds produce sedation alongside relaxation by broadly increasing inhibitory neurotransmission. L-Theanine's alpha wave promotion produces a qualitatively different state calm without drowsiness appropriate for daytime use, work, and study.

L-Theanine influences brain chemistry through four complementary mechanisms. First, glutamate receptor modulation: structurally similar to glutamate, L-Theanine acts as a partial agonist at NMDA receptors and moderates excitatory neurotransmission without fully blocking it. Second, GABA support: L-Theanine increases GABA (gamma-aminobutyric acid) levels, the primary inhibitory neurotransmitter, contributing to calm and relaxation. Third, dopamine modulation: L-Theanine increases dopamine in certain brain regions, supporting motivation, mood, and focused mental state under stress. Fourth, serotonin influence: L-Theanine may also support serotonin levels, contributing to mood balance and emotional resilience.

A standard cup of green tea contains approximately 20–50mg of L-Theanine depending on variety, growing conditions, and brewing method. At 250mg per capsule, one capsule provides the L-Theanine equivalent of approximately 5–12 cups of brewed green tea without caffeine, tannins, or liquid volume. Most L-Theanine supplements on the market contain 100–200mg per capsule. The 250mg dose is at the upper end of commonly available supplemental doses and is consistent with the higher doses used in clinical research on L-Theanine's stress and cognitive effects.

Consult a healthcare practitioner before use if you are pregnant or breastfeeding, or if you are taking medications for blood pressure or stimulant medications. L-Theanine may have mild blood pressure lowering effects; individuals taking antihypertensive medications should consult a healthcare provider before use.