Catechin
Catechin is a flavonoid, a type of plant polyphenol, found in tea, cocoa, apples and grapes.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
Catechin or catechins?
Catechin is a plant compound in the flavan-3-ol family. Tea contains several related compounds, including epicatechin and EGCG; findings about this mixture cannot identify the contribution of catechin alone. 1 2
Why study its antioxidant activity?
A review describes catechin’s ability to interact with reactive molecules as one possible explanation for its biological effects. The authors also identify gaps in understanding the mechanisms; this research question is broader than whether a supplement improves someone’s health. 3
Key studies
The most recent publications linked to Catechin's ratings.
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Is catechin the same as EGCG?
No. USDA lists (+)-catechin and EGCG as separate flavan-3-ols. 1
Can the cholesterol result be attributed to catechin?
The trials tested green tea preparations, so they cannot isolate catechin’s contribution. 2
Is an extract as safe as brewed tea?
EFSA assessed them separately because concentrated supplements raise different liver-safety concerns. 4
Do antioxidant markers prove better long-term health?
The small exercise study measured short-term markers, not later illness or long-term performance. 5
Quercetin
EGCG