Matcha Benefits and Side Effects: How Much per Day Is Safe

Matcha is safe to drink every day for healthy adults, and one to three bowls a day is a sensible amount. A bowl made with 2 g of powder contains about 64 mg of caffeine and about 45 mg of the catechin EGCG. The European Food Safety Authority (EFSA) sets 400 mg of caffeine a day as the safe level for adults and 200 mg in pregnancy. The liver warning you may have read about concerns green tea extract capsules at 800 mg of EGCG a day, about 18 bowls. The side effects that matter for a tea drinker are poorer sleep if you drink it late and reduced iron absorption if you drink it with meals.

Keep two numbers in mind: 2 g of powder per bowl, and 400 mg of caffeine a day. Everything in this article scales with the scoop.

If you want the caffeine figures in detail, read how much caffeine is in matcha. This article covers the rest: what a bowl contains, which benefits have evidence, the side effects, and how much per day is safe.

The short answer

If you are a healthy adult, one to three 2 g bowls a day is well inside every limit EFSA has published, with room for a coffee. If you are pregnant or breastfeeding, stay under 200 mg of caffeine a day from all sources: one bowl a day fits, two if you drink nothing else with caffeine. If your iron levels are low, drink matcha between meals rather than with them, and keep the evening for hojicha.

1. What is actually in a bowl of matcha?

Matcha is whole tea leaf, ground to powder and whisked into water. Nothing stays in the pot, so what is in the leaf is in the cup. Per gram of powder, the Japanese food composition tables (MEXT, 2020 edition) list 32 mg of caffeine. A 2025 laboratory comparison of ceremonial and culinary matcha (Niemeyer et al., Journal of Food Measurement and Characterization) measured EGCG at 22 mg per gram on average in ceremonial grades and 26 mg in culinary grades, with single samples from 4 to 42 mg.

So a standard 2 g bowl holds about 64 mg of caffeine, roughly 45 mg of EGCG, some L-theanine (an amino acid found almost only in tea), chlorophyll, a little fibre and protein, and about 6 kcal. Matcha is not a supplement; it is a concentrated cup of green tea. A brewed cup of sencha delivers a third to a half of these amounts, because most of the leaf stays in the pot.

2. What are the benefits of matcha, and which are proven?

We sell matcha, so read this with that in mind. The caffeine works; it is the same molecule as in coffee, in a smaller dose. Tea also contains L-theanine, and many customers say a bowl feels steadier than an espresso. EFSA reviewed the L-theanine claims in 2011 and found the evidence insufficient for cognitive function, stress or sleep. We find the effect real in our own cups and unproven on paper.

The catechins are antioxidants in the laboratory sense. Whether drinking them changes anything measurable in a healthy person is not settled: EFSA assessed the green tea claims for blood pressure, cholesterol, blood glucose and weight in 2011 and authorised none. No tea seller in Europe may print those claims, and we do not.

What matcha reliably does is replace something. A bowl has about 6 kcal and no sugar; if it stands in for a sweetened coffee drink, the benefit is arithmetic, not pharmacology. And it takes three minutes to make with your hands, which is the part most people come back for.

3. What are the side effects of matcha?

Sleep. EFSA notes that a single 100 mg dose of caffeine can affect sleep in some adults when taken close to bedtime, and caffeine has a half-life of two to eight hours. A 2 g bowl at 17:00 leaves a good part of its 64 mg in your blood at 22:00. If you sleep lightly, make your last bowl before 15:00 and drink roasted hojicha in the evening; a brewed cup has about 30 mg.

Iron. Tea polyphenols bind non-haem iron, the kind in plants, eggs and fortified cereals. In a controlled trial (Samman et al., American Journal of Clinical Nutrition, 2001) a green tea extract added to a meal cut iron absorption from 12.1 to 8.9 percent, about a quarter. If you have low ferritin, are vegetarian or are pregnant, drink your matcha an hour away from meals and iron tablets.

Liver. In 2018 EFSA concluded that green tea extract supplements delivering 800 mg or more of EGCG a day may cause early signs of liver damage. The same opinion found no such signal from green tea drunk as tea, even at high intakes. At 45 mg a bowl you would need 18 bowls a day to reach that threshold. Do not take extract capsules on top of your matcha; that is where the cases came from.

Pesticides. Because you eat the leaf, the field matters more than with brewed tea. Our matcha comes from one family farm in southern Kyoto that grows without pesticides. Whoever you buy from, ask which farm grew the leaf and in which prefecture.

The first summer at the teahouse I drank matcha whenever a guest wanted to try a new lot with me, sometimes five or six bowls by closing. On paper that is 350 mg of caffeine, inside the limit. In practice I was awake at two in the morning. Now I taste with a 1 g bowl after 15:00 and sleep like everyone else.

How much matcha a day is safe?

Limits from EFSA's 2015 caffeine opinion and its 2018 opinion on green tea catechins, converted to 2 g bowls at 64 mg of caffeine and about 45 mg of EGCG each. Estonian and Finnish health guidance uses the same 200 mg figure for pregnancy. Checked September 2026.

Who	Caffeine limit per day	In 2 g bowls	What we suggest
Healthy adult	400 mg (single dose 200 mg)	up to 6	1–3 bowls, last one before 15:00
Pregnant or breastfeeding	200 mg from all sources	up to 3	1 bowl, 2 if no coffee or cola; Estonian guidance suggests 100 mg
Sensitive to caffeine	no fixed limit	–	1 g bowls (32 mg), or brewed hojicha
Teenager, 50 kg	3 mg per kg, so 150 mg	up to 2	1 bowl or a light latte
Green tea extract capsules	800 mg EGCG (about 18 bowls)	–	skip the capsules, drink the tea

For most readers the limit is not the problem; timing is. Two bowls before mid-afternoon, and there is nothing else to manage. At €29.90 for 30 g, two bowls a day cost about €4.