Matcha and Stress: Does L-Theanine Really Work?

Reading time: approx. 7 minutes | Last updated: May 2026

L-theanine, the amino acid that occurs naturally in matcha, is proven to lower cortisol and reduce perceived stress in healthy adults. Three randomized, double-blind studies confirm this effect. Matcha is therefore not a placebo, but a scientifically backed choice for stressful days.

Work stress, study pressure, busy city lives in Amsterdam, Rotterdam, Utrecht, Almere, or Zaandam: stress is one of the most frequently reported complaints in the Netherlands. Coffee is the standard solution, but caffeine without L-theanine actually further increases cortisol. Matcha does the opposite. Also read how L-theanine improves your focus through the same mechanism.

Definition: Cortisol is the body's primary stress hormone. A chronically elevated cortisol level is linked to poor sleep, weight gain, reduced immune function, and anxiety symptoms. L-theanine inhibits the cortisol response to stressors via the autonomic nervous system.

What Does Science Say About L-Theanine and Stress?

Quick answer: Three independent randomized studies show that L-theanine significantly lowers the subjective experience of stress, reduces cortisol after a stressor, and decreases anxiety symptoms with daily use over four weeks.

Study 1: Cortisol lowered after stressor (White et al., Nutrients, 2016)

A double-blind, placebo-controlled crossover study published in Nutrients (White et al., 2016, PMC4728665) examined 34 healthy adults (18-40 years). After a cognitive stress test, the subjective experience of stress was significantly lower in the L-theanine group compared to placebo (p < 0.01) after one hour. Salivary cortisol was significantly lower after three hours. Resting-state alpha waves in the brain were significantly higher, an objective measure of relaxed alertness.

Study 2: Anxiety and stress reduced after 4 weeks (Hidese et al., Nutrients, 2019)

A randomized, double-blind crossover study in Nutrients (Hidese et al., 2019, PMC6836118) gave 30 adults 200 mg of L-theanine per day or a placebo for four weeks. Results: the State-Trait Anxiety Inventory score decreased significantly (p = 0.006), the Self-rating Depression Scale decreased (p = 0.019), and the sleep quality score improved (p = 0.013). Verbal fluency and executive functions also improved significantly.

Study 3: 21% improvement in stress scores after 28 days (Moulin et al., Neurology & Therapy, 2024)

The most recent study, published in Neurology & Therapy (Moulin et al., 2024), randomized 30 adults with moderate stress to 400 mg of L-theanine per day or a placebo for 28 days. The L-theanine group improved by 21.79% on the Stroop cognitive attention test after 14 days (p = 0.005) and perceived stress decreased significantly. Sleep quality and light sleep also improved significantly.

How Does L-Theanine Work on Stress?

Quick answer: L-theanine works via three pathways simultaneously: it increases GABA (calming neurotransmitter), increases alpha waves in the brain (relaxed alertness), and inhibits cortisol release via the autonomic nervous system.

Pathway 1: GABA increase

L-theanine increases the activity of GABA, the primary inhibitory neurotransmitter in the central nervous system. GABA calms overactive nerve cells and reduces overall tension in the nervous system. This is the same mechanism as sedatives, but mild and without the risk of addiction.

Pathway 2: Activating alpha waves

L-theanine is proven to stimulate alpha wave activity in the brain, measurable via EEG. Alpha waves are associated with a state of relaxed alertness: calm but focused. This is precisely the state that meditation and mindfulness aim to achieve. Matcha is essentially a drinkable alpha wave supplement.

Pathway 3: Dampening the cortisol response

Under stress, the body activates the hypothalamic-pituitary-adrenal axis, which leads to cortisol production. L-theanine inhibits this process via the autonomic nervous system and lowers the cortisol spike after a stressor. This explains why people who switch from coffee to matcha consistently report fewer feelings of stress, even with equal caffeine intake.

Matcha vs. Coffee on Stressful Days

Quick answer: Coffee increases cortisol and intensifies the stress response via caffeine without a buffer. Matcha contains the same caffeine but L-theanine dampens the cortisol spike. For people with work stress or chronic stress, this is a relevant difference.

Using Matcha on Stressful Days: Practical Schedule

Quick answer: Drink your first matcha upon waking to buffer the morning cortisol spike. A second cup before a stressful meeting or deadline provides focus without extra tension. Stop drinking matcha at least 6 hours before bedtime.

Want to know more about the perfect timing? Read our article about matcha and sleep: are you drinking it at the right time for a complete daily schedule.

Matcha for Work Stress in the Netherlands

Work stress is one of the biggest health problems in the Netherlands: more than 1.3 million employees experience burnout symptoms, according to CBS (Statline, 2023). Increasingly, people in Amsterdam, Rotterdam, Utrecht, The Hague, Haarlem, Almere, Zaandam, Hoofddorp, Purmerend, Laren, Soest, Venlo, and Alphen aan den Rijn are seeking natural ways to reduce stress symptoms. Matcha is a scientifically backed addition to other interventions like exercise, sleep, and mindfulness.

Ceremonial matcha from Kagoshima by Unmatched Matcha provides the highest L-theanine concentration per cup, thanks to the long shading period of at least 20 days. Order via the webshop, free shipping from €50.

Frequently Asked Questions About Matcha and Stress

Does matcha really help against stress?

Yes, based on three randomized, double-blind studies. L-theanine lowers cortisol, increases alpha waves, and significantly reduces the subjective experience of stress. The effect is mild but consistent and occurs after just one cup.

How much matcha do you drink for stress relief?

The studies use 200-400 mg of L-theanine per day. One cup of ceremonial matcha (2 grams) provides 30-60 mg of L-theanine. For a noticeable stress effect, 2-3 cups per day, spread throughout the day, are optimal.

Does matcha also work for anxiety symptoms?

The study by Hidese et al. (2019) showed a significant decrease in the State-Trait Anxiety Inventory score with four weeks of daily use. For clinical anxiety disorders, matcha is not a replacement for professional treatment. Consult a doctor for severe symptoms.

Is matcha better than coffee for work stress?

For people with work stress: yes. Coffee actively increases cortisol via caffeine without a buffer. L-theanine in matcha dampens that same cortisol response. With equal caffeine intake, matcha produces less stress increase and a more stable energy profile.

How quickly do you notice the effect of L-theanine on stress?

The acute effect (less tense feeling, more alpha waves) occurs within 30-60 minutes after intake. The structural effect on anxiety and cortisol balance is measurable after 4 weeks of daily use, as shown in the Hidese study.