Is matcha good for you? What the evidence actually says

Matcha is made from tencha, green tea leaves that are shade-grown before harvest, then steamed, dried and stone-milled into a fine powder. Because you whisk the powder into water and drink all of it, you take in the whole leaf rather than an infusion of it. That is the one real difference between matcha and a cup of steeped green tea.

• Caffeine. Published lab measurements put matcha at roughly 19 to 44mg of caffeine per gram, depending on the leaf and grade. At a 3g serving, a typical bowl holds roughly 70mg to 90mg, a little below a cup of filter coffee.
• L-theanine. An amino acid that is unusually high in shade-grown tea, and a large part of matcha's savoury, umami taste.
• Catechins. Green tea polyphenols, of which EGCG (epigallocatechin gallate) is the most abundant.

This is the claim with the most research behind it, and the honest answer is: possibly a little, mostly because of the caffeine. A small placebo-controlled study in 2017 found better attention and reaction speed after matcha, and the authors put it down to caffeine and L-theanine working together. A 2025 meta-analysis of 50 trials on caffeine combined with theanine found the effects on attention and mood too uncertain to say which way they point or how big they are.

What many people describe, a steadier lift than coffee with less of a crash, is plausible given the theanine, but it has not been proven in large trials. Treat it as a reason to try matcha, not as a promise.

You will read that matcha burns fat, detoxes the liver, prevents cancer or boosts your immune system. None of these is an authorised health claim in Great Britain, and there are no authorised weight-loss claims for green tea at all. Most of the studies behind them were done on concentrated green tea extracts, on cells, or on animals, not on people drinking a bowl of matcha.

A 12-month randomised trial gave matcha to older adults with cognitive decline and published its results in 2024. It is one of the few long human trials using matcha itself rather than an extract, and it is worth reading in full to see how modest and specific the findings in this field tend to be.

For most healthy adults, caffeine is the limit that matters. The NHS and the European Food Safety Authority both use 400mg of caffeine a day as a safe upper amount for adults, and 200mg a day in pregnancy. At roughly 70mg to 90mg a bowl, that is several bowls, but count your coffee, tea and energy drinks too.

The other limit is catechins. EFSA found that taking 800mg or more of EGCG a day as a supplement was linked to raised liver enzymes, while green tea prepared in the traditional way is generally considered safe. A bowl of matcha is well below that, but it is one reason to be wary of green tea extract pills.

If you are pregnant, taking medication, or have a heart or liver condition, ask your GP or pharmacist before making matcha a daily habit.

For taste, a great deal. For the compounds above, it matters too, because theanine is highest in young, shade-grown first harvest leaves and falls in later, sun-exposed harvests. Freshness also counts: once milled, matcha oxidises, loses colour and turns flatter and more bitter over the following weeks. We explain that in why matcha fades.

Our matcha comes from a tea house with nearly two centuries of expertise in Uji, Kyoto Prefecture. First harvest, milled in Uji each month, packed in London the week it's sold. We sell it as a good drink, not as a supplement, and we would rather you enjoyed one bowl a day than forced down three.