How much matcha a day? Dose, caffeine and limits

How much matcha a day is sensible?

For most healthy adults, one to three bowls a day at about 2 g each is a sensible amount. That works out at roughly 48 to 144 mg of caffeine, well below the 400 mg that health authorities use as a daily reference. Everything else depends on how much coffee is already in your day.

What is in the bowl, before we talk quantities

Matcha is whisked with hot water and drunk unfiltered. You are not drinking an infusion, you are drinking the milled leaf. That changes the arithmetic against any teabag, which is why composition and trial evidence are worth separating.

1. Where the 137 figure comes from: an analytical paper in the Journal of Chromatography A in 2003 (Weiss and Anderton, PMID 14518774). It quantified five catechins and the caffeine content of matcha by micellar electrokinetic chromatography and measured, per gram of dry leaf, an EGCG concentration 137 times higher than the green tea China Green Tips, and at least three times higher than the highest published value for other green teas. Analytical chemistry on dry leaf, not a trial in people.

2. What was measured on attention: a randomised placebo-controlled trial in Nutrition Research in 2021 (Baba et al., PMID 33744591) gave 2 g of matcha daily for two weeks to 42 adults aged 25 to 34 and recorded reaction times in the Stroop test after stress induction with the Uchida-Kraepelin test.

3. What was measured in older people: a randomised, double blind, placebo-controlled 12 month trial in PLoS One in 2024 (Uchida et al., PMID 39213264) followed 99 older adults with subjective or mild cognitive decline, 49 on 2 g of matcha daily and 50 on placebo. The primary outcome, the Montreal Cognitive Assessment, did not change significantly. The facial emotion perception score did.

4. What was measured on blood lipids: a systematic review with meta-analysis of 31 randomised trials and 3,321 subjects in Nutrition Journal in 2020 (Xu et al., PMID 32434539) compared total cholesterol, LDL, HDL and triglycerides in green tea drinkers against controls.

5. What was measured on sleep: a randomised, double blind, placebo-controlled trial in Nutrients in 2024 (Baba et al., PMID 39275223) gave Japanese adults aged 27 to 64 two point seven grams of matcha daily for four weeks and recorded sleep by electroencephalography. It found no differences in total sleep time, latency, wake after sleep onset or efficiency.

6. What has been reviewed on mood: a systematic review of randomised trials in Biomedicines in 2025 (Cavanah et al., PMID 40722728) gathered 13 studies on green tea, its extracts, EGCG or L-theanine and mood disorder symptoms, six of them using extract, matcha or traditional green tea.

How much caffeine sits in one bowl

According to the USDA database, 100 g of matcha contains 2.4 g of caffeine, about 24 mg per gram. At 2 g per bowl that is roughly 48 mg. Three bowls come to about 144 mg. For comparison, a 240 ml cup of coffee is around 96 mg. If you already drink two coffees in the morning, count them in rather than pretending tea does not register.

When it becomes too much

• Adults: one to three bowls a day at about 2 g each, so around 6 g of powder a day as a practical ceiling.
• Caffeine sensitivity: if you are prone to restlessness, palpitations or trouble sleeping, stay at one bowl and drink it in the morning.
• Existing conditions: with heart disease, kidney disease or stomach ulcers, check with a professional first.
• Pregnancy, breastfeeding, medication: speak to your doctor before changing your caffeine intake.

Three practical notes

1. Quality first: a first-harvest ceremonial grade is mild enough to drink neat. Bitter powder leads straight to the sweetener jar, and then you are drinking sugar with a green tint.
2. Listen to your own response: if you feel wired, reduce the amount rather than shifting the hour and hoping.
3. Do not run at maximum every day: three bowls is a ceiling, not a target.

What a bowl costs

Our Matcha Zen Ceremonial is £19.00 for 100 g, which is around 50 bowls at 2 g each, so roughly 38p a bowl. First harvest, shade grown in Jingshan (China), processed at Zhejiang Camel Transworld in Yuhang (Hangzhou), slow stone milled. Organic certification CCPAE, code ES-ECO-019-CT, plus USDA Organic.

References

1. Weiss DJ, Anderton CR., Determination of catechins in matcha green tea by micellar electrokinetic chromatography. Journal of Chromatography A, 2003. PMID 14518774. https://pubmed.ncbi.nlm.nih.gov/14518774/
2. Baba Y, Kaneko T, Takihara T., Matcha consumption maintains attentional function following a mild acute psychological stress without affecting a feeling of fatigue: A randomized placebo-controlled study in young adults. Nutrition Research, 2021. PMID 33744591. https://pubmed.ncbi.nlm.nih.gov/33744591/
3. Uchida K, Meno K, Korenaga T, et al., Effect of matcha green tea on cognitive functions and sleep quality in older adults with cognitive decline: A randomized controlled study over 12 months. PLoS One, 2024. PMID 39213264. https://pubmed.ncbi.nlm.nih.gov/39213264/
4. Xu R, Yang K, Li S, Dai M, Chen G., Effect of green tea consumption on blood lipids: a systematic review and meta-analysis of randomized controlled trials. Nutrition Journal, 2020. PMID 32434539. https://pubmed.ncbi.nlm.nih.gov/32434539/
5. Baba Y, Takihara T, Okamura N., Matcha Does Not Affect Electroencephalography during Sleep but May Enhance Mental Well-Being: A Randomized Placebo-Controlled Clinical Trial. Nutrients, 2024. PMID 39275223. https://pubmed.ncbi.nlm.nih.gov/39275223/
6. Cavanah AM, Robinson LA, Mattingly ML, Frugé AD., The Impact of Green Tea and Its Bioactive Compounds on Mood Disorder Symptomology and Brain Derived Neurotrophic Factor: A Systematic Review of Randomized Controlled Trials. Biomedicines, 2025. PMID 40722728. https://pubmed.ncbi.nlm.nih.gov/40722728/