Does Matcha Help You Focus?

Matcha is often marketed as a smoother alternative to coffee for concentration and mental energy. Unlike ordinary brewed green tea, matcha is made from finely ground tea leaves that are consumed with the drink rather than removed after steeping. That means the drink contains caffeine alongside L-theanine, catechins and other compounds naturally present in the leaf (Kochman et al., 2021).

Human studies have tested whether that combination actually translates into better attention, memory and performance under stress. The results suggest that matcha can affect some aspects of cognition, particularly reaction time and attention, but the effects are not consistent across every measure (Sokary et al., 2023).

What Is Matcha?

Matcha is a powdered form of Japanese green tea made from Camellia sinensis. Tea plants intended for traditional matcha production are shaded before harvest, then the selected leaves are steamed, dried and ground into a fine powder.

Because the powder itself is consumed, matcha differs from green tea prepared by steeping leaves and discarding them. Its major compounds include caffeine, the amino acid L-theanine and catechins such as epigallocatechin gallate, better known as EGCG (Kochman et al., 2021; Sokary et al., 2023).

The concentration of these compounds can vary substantially between matcha products. Sokary et al. (2023) noted that matcha sold outside Japan may differ in composition from products available in the Japanese market, which makes it difficult to assume that every matcha powder will produce the same effects.

Why Might Matcha Affect Focus?

Matcha supplies caffeine together with L-theanine, an amino acid found naturally in tea. Research reviewed by Kochman et al. (2021) suggests that caffeine and L-theanine together may improve concentration and vigilance more than either compound used alone. Theanine is also one of the compounds associated with matcha’s characteristic umami taste.

Catechins such as EGCG have also attracted interest because of their possible effects on the brain, but most of the evidence concerning neuroprotection and related mechanisms comes from studies of isolated compounds, cells or animals rather than trials showing that drinking matcha produces a meaningful cognitive benefit in people.

Does Matcha Improve Attention?

A 2017 randomised controlled trial tested 4 g of matcha in 23 participants. Cognitive testing 60 minutes later found slight improvements in speed of attention, although matcha did not improve every cognitive measure examined (Dietz et al., 2017, as reviewed by Sokary et al., 2023).

Another trial followed 42 participants who consumed about 2 g of matcha daily for two weeks. The matcha group showed a statistically significant reduction in reaction time and recorded more correct responses on an emotion-perception task, without a corresponding improvement in how focused participants felt (Baba et al., 2021b, as reviewed by Sokary et al., 2023).

Does Matcha Improve Working Memory?

The 2017 acute study found a slight improvement in working memory after participants consumed matcha, but broader evidence for memory enhancement is less convincing (Dietz et al., 2017, as reviewed by Sokary et al., 2023).

A separate 12-week trial involved 54 clinically normal older adults who consumed 1.5 g of matcha twice daily. Matcha did not produce a general improvement across the cognitive tests used in the study. Women showed an improvement in the language domain of the Montreal Cognitive Assessment, but this was a subgroup finding rather than evidence of broad memory enhancement (Sakurai et al., 2020, as reviewed by Sokary et al., 2023).

The available human trials therefore do not show that matcha reliably improves memory in healthy people.

Can Matcha Help You Perform Better Under Stress?

One study compared matcha with caffeine alone and placebo in 51 middle-aged and older adults. Participants were tested after a single dose and again following 12 weeks of regular intake.

Caffeine improved attentional function after the single dose and appeared to account for the faster reaction time also seen with acute matcha consumption. After continued intake, however, the matcha group performed better than the caffeine group on cognitive tasks administered after mild psychological stress (Baba et al., 2021a, as reviewed by Sokary et al., 2023).

In a separate trial involving 39 students, consuming 3 g of matcha daily for 15 days reduced subjective anxiety and lowered salivary amylase, which was used as a physiological marker of stress (Unno et al., 2018, as reviewed by Sokary et al., 2023).

These findings raise the possibility that some cognitive effects of matcha are more apparent when performance is challenged by psychological stress.

Does Matcha Reduce Mental Fatigue?

In the two-week trial that found faster reaction time, matcha did not improve participants’ subjective fatigue, concentration, thinking ability or energy level. The acute 4 g study also found no significant effect on mood (Sokary et al., 2023).

Is Matcha Better Than Caffeine Alone?

In the study that directly compared matcha with caffeine alone and placebo, caffeine improved attention after a single dose, and the researchers attributed part of matcha’s immediate reaction-time effect to its caffeine content. Regular matcha intake performed better than caffeine alone under mild psychological stress after 12 weeks, but the advantage did not extend to every cognitive measure (Baba et al., 2021a, as reviewed by Sokary et al., 2023).

The presence of L-theanine, catechins and other compounds makes matcha pharmacologically more complex than caffeine alone, but one small trial is not enough to conclude that this combination consistently produces superior focus.

How Much Matcha Was Used in Human Studies?

The human studies reviewed by Sokary et al. (2023) used several different preparations and amounts:

• Dietz et al. (2017): 4 g of matcha in a single acute cognitive test
• Baba et al. (2021b): approximately 2.07 g daily for two weeks
• Unno et al. (2018): 3 g daily for 15 days
• Sakurai et al. (2020): 1.5 g twice daily, or 3 g per day, for 12 weeks

The review describes Baba et al. (2021a), which compared matcha with caffeine and placebo over 12 weeks, as using nine matcha capsules per day but does not give an equivalent amount of matcha powder in grams.

The 2.07 g preparation used by Baba et al. (2021b) contained approximately 72.5 mg of caffeine, 50.3 mg of theanine and 171 mg of catechins per day.

These figures describe the preparations used in research rather than an established dose for improving focus. Matcha products can differ in their caffeine, theanine and catechin content.

What Are the Limitations of the Research?

The human evidence consists of relatively few trials with small sample sizes. The studies also differ in duration, matcha dose, participant age and the cognitive tests used, making direct comparison difficult.

Several studies were conducted in Japan, where regular green tea consumption is common. Sokary et al. (2023) noted that participants who already consumed substantial amounts of green tea may have experienced a smaller change in exposure when matcha was added.

Product composition adds another variable. In research cited by the review, only 6 of the matcha products purchased outside Japan contained the level of theanine considered sufficient by those researchers for a stress-reducing effect, compared with 50 of 76 Japanese samples.

Bottom Line

Matcha does not appear to produce a broad cognitive boost across attention, memory, mood, fatigue and mental energy. Human trials have instead found narrower effects, including faster reaction time, slight improvements in attention or working memory, and better performance on some tasks performed under psychological stress.

Its combination of caffeine and L-theanine gives matcha a plausible basis for affecting focus, but current research cannot show that it reliably outperforms caffeine or consistently improves cognition in healthy people.

References

Kochman, J., Jakubczyk, K., Antoniewicz, J., Mruk, H., & Janda, K. (2021). Health benefits and chemical composition of matcha green tea: A review. Molecules, 26(1), 85. https://doi.org/10.3390/molecules26010085

Sokary, S., Al-Asmakh, M., Zakaria, Z., & Bawadi, H. (2023). The therapeutic potential of matcha tea: A critical review on human and animal studies. Current Research in Food Science, 6, 100396. https://doi.org/10.1016/j.crfs.2022.11.015