EGCG in Matcha: What Is Actually Measured?
What EGCG means, what was measured in ten powders, and why a cup cannot be compared with a concentrated extract.
By Roseline Zhou, Founder
Contents
You see “EGCG” associated with matcha and want to know what those letters say about your cup. EGCG is a catechin, one of the polyphenols in green tea. The amount varies from powder to powder. Its presence in matcha, by itself, doesn't justify a health benefit claim.
We'd start by understanding what was measured. A laboratory analysis describes powder samples, without measuring a Kura-ge product or what a person absorbs after drinking the tea.
What does EGCG mean among matcha catechins?
EGCG, or epigallocatechin gallate, is one of the catechins, which are among tea's polyphenols. When people speak of “matcha antioxidants,” they often mean these compounds. The word describes a group and properties studied; it doesn't describe what will happen in your body.
We'd read “contains EGCG” as information about composition, not as a quality rating. When choosing a powder to drink, taste, freshness, and intended use are easier to judge in the cup.
How much EGCG did the studied powders contain?
An analysis of ten powders measured about 37 to 70 mg of EGCG per gram in those matcha samples. Acidified methanol extraction was used to measure the powder in the laboratory. That range doesn't represent every matcha.
We wouldn't multiply it to announce how much EGCG someone absorbs after a bowl. The study measured neither your exact preparation nor absorption by your body. No Kura-ge batch was among the samples.
Does “antioxidant” mean a health benefit?
The study also tested antioxidant properties in the laboratory. These tests observe how samples react under defined conditions. They don't demonstrate that a cup protects an organ, prevents disease, or produces a measurable effect in a person. Benefits attributed to matcha require the same distinction between composition and demonstrated effect.
Research on catechins remains of interest within the limits of what it measures. For the tea in our cup, we'd rather discuss flavor and composition than turn a laboratory test into a health promise.
Is a cup equivalent to a concentrated extract?
No. An extract used in a supplement and a tea drink don't necessarily have the same concentration or use. The assessment of green tea supplements raises concerns starting at 800 mg of EGCG per day in that context. This figure does not set a limit per cup of matcha.
We wouldn't turn that supplement reference point into a recommended amount for a bowl. To know the EGCG content of a particular powder, it would need to be analyzed.
Should you change how you prepare tea to target an EGCG number?
We'd first choose amounts of powder and water that you enjoy for their flavor. Matcha's caffeine content also varies with the amount used. Adjusting a bowl to chase a value inferred from an analysis wouldn't measure what you drink.