Matcha has a documented effect on the nervous system that sets it apart from other caffeinated drinks. The amino acid L-theanine, present in significant concentrations in matcha, promotes relaxation without sedation, moderates the stimulant effect of caffeine, and has been studied directly for its effects on stress and anxiety. This article covers that research, and what it means practically for a daily matcha habit.
What L-theanine does in the brain
L-theanine is an amino acid found almost exclusively in tea leaves, with matcha containing it in notably higher concentrations than brewed green tea, because you consume the whole leaf rather than steeping and discarding it. Once absorbed, L-theanine crosses the blood-brain barrier and influences several neurotransmitter systems: it increases alpha brain wave activity — the same pattern associated with meditation and relaxed focus — while also elevating GABA, serotonin, and dopamine levels (Nobre, Rao & Owen, 2008; Hidese et al., 2019).
Importantly, L-theanine promotes relaxation without causing drowsiness. This makes it distinct from sedative supplements and compatible with daytime use. It also offsets the anxious edge that some people experience from caffeine alone, which is why matcha tends to produce a different mental state than the same amount of caffeine from coffee.
L-theanine promotes relaxation without causing drowsiness — compatible with focus, not opposed to it.
Sipspa
At Sipspa, the matcha we source from Kyushu, Japan is shade-grown to maximise L-theanine content in the leaf. The shade period limits photosynthesis, causing the plant to accumulate this amino acid rather than convert it. L-theanine is the compound most consistently linked to matcha's calm-without-drowsiness quality.
What the research shows on stress and anxiety
Several controlled studies have looked directly at L-theanine and stress response. Hidese et al. (2019) conducted a randomised controlled trial in healthy adults and found that L-theanine supplementation led to a significant reduction in subjective stress and anxiety levels, alongside improvements in sleep quality and some cognitive measures. The doses used were in the range of 200–400mg of L-theanine, which exceeds a typical matcha serving but is informative about mechanism.
Kimura et al. (2007) found that L-theanine reduced both psychological and physiological markers of acute stress in participants with high trait anxiety — including heart rate and salivary immunoglobulin A — compared to placebo. The effect was observed during a stressful task, suggesting it may help blunt the acute stress response rather than simply making people feel calmer in baseline conditions.
Does EGCG also play a role?
Possibly. EGCG, the main catechin in matcha, may support mood regulation via BDNF, though the evidence in humans is still early. L-theanine remains the more established contributor to matcha's calming effect.
Beyond L-theanine, matcha is rich in catechins, particularly EGCG. Singh et al. (2011) found that EGCG may increase brain-derived neurotrophic factor (BDNF), a protein involved in neuron health and mood regulation. Lower BDNF levels are associated with anxiety and depression in some research contexts, though the direct effect of dietary EGCG on human BDNF is not yet fully established.
The neuroprotective research on EGCG is early but consistent in direction. Taken together with the L-theanine evidence, it suggests matcha has more than one pathway through which it may support a calmer mental state.
Using matcha daily for calm
A 2g serving whisked into 70ml of water at 80°C, prepared slowly and drunk warm, is probably the most direct way to use matcha for its calming properties. The preparation itself has a grounding quality — there is a reason the Japanese tea ceremony is considered a meditative practice. If you would like to explore matcha as part of a mindfulness routine, that is a natural extension.
Replacing an afternoon coffee with matcha is another practical step. The caffeine in matcha (60–80mg per 2g serving) provides a functional lift, while L-theanine keeps the experience calmer. Most people who are sensitive to the edge of coffee find matcha considerably more comfortable at the same time of day. For methods of preparation, see how to make matcha.
Does matcha help with anxiety?
The L-theanine in matcha has been studied for its effects on anxiety and stress response, with controlled trials showing reductions in subjective anxiety and physiological stress markers. Matcha is not a treatment for anxiety disorders, but the evidence for L-theanine's calming properties is reasonably consistent. If you have a clinical anxiety condition, speak with a healthcare provider.
Can matcha cause anxiety?
In some people, particularly those sensitive to caffeine, matcha can contribute to anxious feelings if consumed in excess. A 2g serving contains 60–80mg of caffeine. The L-theanine moderates this for most people, but if you find matcha makes you feel wired rather than calm, reducing the dose or drinking it with food is worth trying.
Is matcha better than coffee for anxiety?
Many people who find coffee triggers anxiety or jitteriness report that matcha is more comfortable. This is largely attributed to L-theanine moderating the caffeine effect. At equivalent caffeine amounts, matcha tends to produce a calmer, more sustained energy than coffee. That said, individual responses vary, and the dose matters.
The research on L-theanine and stress is among the more reliable in the green tea literature. The effects are real, if modest, and the practical case for a daily matcha habit is grounded in something more than marketing. If you are looking for a drink that supports focus and calm together, our matcha is single-ingredient, no blends or additives, sourced from Japan.
Sources
- 1. Nobre, A. C., Rao, A., & Owen, G. N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition, 17(S1), 167–168.
- 2. Hidese, S., et al. (2019). Effects of L-Theanine administration on stress-related symptoms and cognitive functions in healthy adults: a randomized controlled trial. Nutrients, 11(10), 2362.
- 3. Kimura, K., Ozeki, M., Juneja, L. R., & Ohira, H. (2007). L-Theanine reduces psychological and physiological stress responses. Biological Psychology, 74(1), 39–45.
- 4. Singh, B. N., Shankar, S., & Srivastava, R. K. (2011). Green tea catechin, epigallocatechin-3-gallate (EGCG): Mechanisms, perspectives and clinical applications. Biochemical Pharmacology, 82(12), 1807–1821.
- 5. Dietz, C., & Dekker, M. (2017). Effect of green tea phytochemicals on mood and cognition. Current Pharmaceutical Design, 23(19), 2876–2905.
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