Tea Blog

With all the attention given to the potential health benefits of tea, certain terms come up again and again. One of those is catechins. Which leads to an obvious question—what exactly are they?

I have to admit that, despite writing about tea regularly, I wasn’t entirely clear on this myself. So I set out to demystify the subject.

Let’s begin with a dictionary definition. According to Merriam‑Webster, catechins are “a crystalline compound … related chemically to the flavones, found in certain plants, and used in dyeing and tanning.” Not exactly the most appealing description when you’re thinking about what’s in your cup of tea—but let’s dig a little deeper.

A more accessible explanation comes from this overview of catechins and their role as plant compounds. Catechins are a type of natural phenol and antioxidant, part of a broader group of compounds known as flavonoids. These compounds occur naturally in plants and contribute to both flavor and potential health-related properties.

They aren’t found only in tea, either. Catechins are present in a variety of foods, including cocoa, dark chocolate, certain fruits, and even some plant oils.

For a clearer breakdown, this university fact sheet explaining catechin compounds describes catechins as part of the flavanol family. It also identifies several specific types, including:

• Catechin
• Epicatechin
• Epigallocatechin
• Epicatechin gallate
• Epigallocatechin gallate (EGCG)

These compounds vary in concentration depending on the food source. When it comes to tea, green tea stands out for having especially high levels of certain catechins—particularly EGCG—while black tea also contains significant amounts, though generally at lower levels due to processing.

The fact sheet also touches on the many claims surrounding catechins and their potential health benefits, while noting that some of the enthusiasm has been amplified by media attention—particularly when it comes to tea, red wine, and chocolate.

For another perspective, see this overview of tea components and their potential benefits from a Japanese tea producer, which highlights how catechins contribute to tea’s overall profile.

So while the scientific terminology may sound intimidating, catechins are simply natural plant compounds—especially abundant in tea—that contribute to both its flavor and its reputation as a healthful beverage.

See more of William I. Lengeman’s articles in this archive of tea science and commentary.

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