Before harvesting tea for traditional matcha, growers shade the plants for approximately three weeks. The reduced sunlight changes the leaves' colour and chemical composition, notably their chlorophyll and amino-acid profile. Because the finished tea is ground to a fine powder and swallowed rather than strained, consumers also take in substances from the whole leaf. The French Chabiothé article discusses antioxidants, L-theanine, caffeine, aluminium, blood sugar and cosmetic uses. Here is a fuller explanation of those subjects, including what remains uncertain.
Matcha and its antioxidant compounds
Matcha contains a range of naturally occurring polyphenols, including catechins such as EGCG. These compounds can interact with free radicals and are frequently described as antioxidants. The original French article cites an ORAC value of 1,384 for matcha compared with 31 for broccoli. ORAC is a laboratory measurement, not a clinically validated scale of the benefits of eating or drinking particular foods. Such figures should not be used to promise better health or rank the protective effect of a bowl of matcha over vegetables.
The article also mentions research on green tea, cancer-related mechanisms and intestinal polyps. Some studies have investigated green-tea extracts, supplements or unusually large amounts of tea; they are not equivalent to drinking one or two bowls of matcha. In particular, an often-cited study on polyps must not be presented as showing that matcha prevents cancer or reduces a person's tumour risk by a stated percentage.
Matcha's polyphenol content is an interesting part of its composition, but antioxidant activity in a test tube does not establish an anti-cancer effect in people. For anyone dealing with illness, tea is a drink to enjoy, not a replacement for evidence-based medical care.
Original French article reference: PubMed record on green-tea research. This reference concerns research questions; it does not constitute proof of a medical benefit from Chabiothé matcha.
L-theanine: one of matcha's characteristic amino acids
L-theanine is an amino acid found naturally in tea leaves and first isolated by Japanese researchers in 1949. The French article notes that it can represent a small percentage of the leaf's weight, varying with the tea. Shading tea plants to produce tencha is one of the methods associated with a richer amino-acid profile. L-theanine also contributes to the characteristic savoury, umami taste that many tea lovers value in good matcha.
Researchers have studied L-theanine alone and in combination with caffeine, particularly in relation to attention, perceived stress, relaxation and aspects of cognition. The original French version also discusses proposed effects involving dopamine, serotonin and sleep. Such mechanisms and findings do not demonstrate that an ordinary serving of matcha will change neurotransmitter levels in a clinically meaningful way, cure insomnia or reduce anxiety.
Many matcha drinkers describe a pleasant balance between the stimulation of caffeine and the rounded taste of the tea. Yet caffeine sensitivity varies, and there is no guarantee that a combination with L-theanine will prevent nervousness or sleep problems. The simplest way to judge your own tolerance is to keep track of how much powder you use and when you drink it.
Matcha and caffeine: how much is in a bowl?
The French Chabiothé article uses an illustrative comparison of around 45 mg of caffeine per bowl of matcha, roughly 100 mg in a cup of coffee and 15–45 mg in a cup of brewed green tea. These are indicative figures, not fixed amounts. The result depends heavily on serving size, the particular tea, the brewing method and the volume of the drink. A larger bowl made with more powder can provide considerably more caffeine than a smaller one.
Caffeine can temporarily improve alertness and attention. Some people find matcha gentler than coffee, but the idea that tannins necessarily slow its absorption enough to prevent peaks of stimulation should not be treated as a guarantee. Too much caffeine may lead to agitation, palpitations, digestive discomfort or difficulty sleeping, especially for those who are sensitive to it.
Keep matcha's caffeine contribution in mind alongside coffee, other teas, cola and energy drinks. Pregnant people, children and anyone with medical reasons to restrict caffeine should seek appropriate advice on their total intake.
Matcha and aluminium: a point requiring particular attention
In September 2026, the French consumer organisation UFC-Que Choisir published an investigation into aluminium in matcha. Tea plants can take up aluminium naturally present in soils. Unlike a conventional tea infusion, matcha is consumed as ground leaf, meaning that the substance present in the powder is swallowed with it. The investigation analysed seven matcha products and detected aluminium in all seven; under its comparison assumptions, four exceeded an Anses reference value.
The French Chabiothé article reports a laboratory result from late 2024 of 1,000 mg of aluminium per kilogram of its own matcha. This is a value reported by Chabiothé; the underlying laboratory certificate was not part of the material supplied for this translation and has not been independently verified here. The measured concentration is distinct from the amount a person consumes. For example, 2 g of powder at 1,000 mg/kg corresponds to 2 mg of aluminium in that portion; this must be considered alongside all other dietary sources, the person's body weight and the relevant health-agency guidance.
The French page correctly notes that there is no specific legal maximum concentration for aluminium in matcha. That does not mean that all products are equally contaminated or that a particular serving is necessarily safe or unsafe. The available evidence supports a cautious message: avoid excessive quantities, consider exposure from the rest of the diet, and ask the supplier for an up-to-date product analysis when possible.
Read the UFC-Que Choisir investigation published on 24 September 2026 for the original public report. The findings concern the products tested, not necessarily every batch of matcha sold by every retailer.
Can matcha help regulate blood sugar?
EGCG and other tea catechins have been studied in relation to blood-glucose metabolism. The French article describes possible effects on blood-sugar peaks and the risk of type 2 diabetes. These are research hypotheses and findings that cannot be turned into promises that drinking matcha will lower blood sugar, prevent diabetes or replace a prescribed treatment.
If you like matcha, one practical consideration is what you add to it: a latte with lots of sugar or sweet syrup has a different nutritional profile from plain whisked matcha. People managing diabetes should follow the guidance of their healthcare team.
Matcha in homemade skincare and hair care
Matcha is also used in homemade beauty preparations, including face masks and hair products. Its rich green colour and fine texture make it popular in DIY recipes, while its catechins inspire claims about pollution, UV exposure, pores, sebum and hair strength. The original French article mentions all of these possible uses.
However, the presence of antioxidants in matcha powder does not prove that a mask protects the skin from sunlight, prevents ageing, closes pores or strengthens hair. Homemade cosmetics may irritate the skin or cause reactions, so patch-test first, avoid broken skin and keep products away from the eyes. A matcha mask is not a substitute for sunscreen or recognised skincare products.
Different matcha qualities and grades
Matcha sellers commonly describe products as culinary, blending or café, premium, ceremonial and prestige grades. Chabiothé presents its matcha as premium grade, intended to provide an approachable introduction to the drink. As explained in the French text, purchasing in larger volumes is part of the company's pricing approach. The colour, fineness, origin, freshness and flavour matter, while a grade name does not establish a particular medical effect.
Matcha is versatile: besides being whisked into warm water, it can be used in lattes, smoothies, desserts, biscuits and even some savoury dishes. For an explanation of the five grades, see our full matcha guide. For practical preparation, including the Japanese method, see our matcha preparation article.
FAQ — Antioxidants, caffeine and L-theanine in matcha
Why is matcha described as antioxidant-rich?
It contains naturally occurring catechins, including EGCG, which show antioxidant activity in laboratory studies. Because the powdered leaf is swallowed, the intake differs from a filtered tea infusion. This is not proof that matcha prevents disease or protects the body's cells in any particular clinical way.
Does matcha strengthen the immune system?
There is no reliable basis for promising that a cup of matcha boosts immunity simply because it contains polyphenols and other plant compounds. The French source discusses this as a popular claim, not as an established treatment.
Does matcha provide energy without nervousness?
Matcha contains caffeine, which can increase alertness. L-theanine has been studied in connection with attention and relaxation, but it does not guarantee an absence of jitters, anxiety or sleep disruption.
How often should matcha be consumed?
There is no proven universal number of cups that delivers health benefits. Consider the amount of powder in each serving, your total caffeine intake and product quality, including possible exposure to aluminium. Moderation is particularly sensible for anyone drinking matcha often.
Can matcha help concentration?
Caffeine can temporarily improve wakefulness and attention; research has also explored the combination of caffeine and L-theanine. The size and duration of any effect depend on the person and the dose.