Catechin ((+)-Catechin · Flavan-3-ol · Antioxidant · Cardiovascular)

Compound	(+)-Catechin ((+)-3,3′,4′,5,7-Pentahydroxyflavane; (+)-Catechin hydrate)
Chemical class	Polyphenol — Flavan-3-ol (C-ring saturated, C-3 hydroxyl; parent of catechin class)
CAS	154-23-4
Primary source	Camellia sinensis (green tea leaves), Theobroma cacao (cocoa), Vitis vinifera (grape skin/seed)
Key applications	Antioxidant; cardiovascular; anti-inflammatory; gut microbiome; antimicrobial
Claim strength	Moderate
Typical form	EGCG 50% Green Tea Extract (catechin co-delivered in catechin spectrum); Green Tea Catechin Concentrate; Cocoa Extract
Buy from Herbuno	EGCG 50% Powder (Green Tea Extract) | Standardized Camellia sinensis →

Name origin: Catechin derives from Acacia catechu (black cutch/catechu) — the Indian tree from whose heartwood it was first extracted in the 18th century. "Catechu" itself traces to the Hindi word "kath" (wood extract) reflecting the traditional extraction process. Despite this naming origin, Camellia sinensis (tea) is now the primary commercial and pharmacological source. Traditional use: Green tea (Camellia sinensis) has been consumed in China for over 4,000 years — with detailed accounts of its preparation and medicinal use in the Tang Dynasty "Tea Classic" (Cha Jing) by Lu Yu (760 CE). Traditional Chinese and Japanese green tea culture attributes tea with properties of mental clarity, longevity, and digestive wellness — properties now mechanistically understood through the catechin fraction. Catechu (Acacia catechu, Katha in Ayurveda) is used in Ayurvedic medicine as an astringent for digestive, oral health, and skin applications. Research trajectory: Catechin is the founding member of the flavan-3-ol class — the biosynthetic precursor to oligomeric proanthocyanidins (OPCs) and the aglycone template for the catechin series (catechin, epicatechin, EGCG, EGC, ECG). Its individual pharmacology has been studied alongside the broader catechin family, with cardiovascular, antioxidant, and gut microbiome-modulatory activities consistently demonstrated. Commercial source: Catechin is available from Herbuno via EGCG 50% Powder (Green Tea Extract), which delivers catechin as part of the full Camellia sinensis catechin spectrum alongside EGCG, EGC, ECG, and epicatechin.

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Evidence for Catechin Applications

Antioxidant activity: Catechin's pyrogallol-type B-ring (3′,4′,5′ — wait: catechin has 3′,4′-catechol B-ring) and C-ring 3-hydroxyl confer high radical scavenging activity. ORAC and FRAP values rank catechin among the most potent dietary antioxidants. In plasma, catechin metabolites (glucuronides, sulphates) extend antioxidant activity for 4–6 hours post-ingestion. Metal chelation (iron, copper) prevents Fenton-type radical generation in tissue. Claim strength: Moderate.

Cardiovascular: Catechin and the broader tea catechin fraction improve endothelial function (eNOS activation), reduce LDL oxidation, inhibit platelet aggregation (thromboxane A₂ suppression), and modestly reduce LDL cholesterol in multiple small RCTs and meta-analyses. The Mediterranean diet's cardiovascular benefits partly reflect catechin intake from wine and tea. The PREDIMED study and others implicate catechin-rich food patterns in 30% reduced cardiovascular mortality. Claim strength: Moderate.

Anti-inflammatory and gut microbiome: Catechin suppresses NF-κB and COX-2, reducing inflammatory cytokine production. As a flavan-3-ol, catechin reaches the colon largely intact (incomplete absorption in small intestine) and functions as a prebiotic substrate — selectively enriching Lactobacillus, Bifidobacterium, and Akkermansia muciniphila while reducing pathobionts. This gut microbiome-modulatory activity may explain tea's association with metabolic and immune health independently of systemic catechin absorption. Claim strength: Moderate.

Antimicrobial: Catechin disrupts bacterial cell membranes, inhibits virulence factors (adhesins, toxins), and synergises with conventional antibiotics against S. aureus (including MRSA) and H. pylori. Oral health applications — catechin-containing mouthwash reducing S. mutans biofilm — have been clinically evaluated. Claim strength: Moderate.

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Dosage & Formulator Specification

Catechin does not have its own dedicated clinical dosing protocol — it is typically studied as part of total catechin or green tea extract preparations. Green tea extract clinical studies have used 200–800 mg/day total catechins (EGCG + EGC + ECG + catechin + epicatechin) over 4–24 weeks. Catechin typically represents 5–15% of total catechin content in green tea extract, with EGCG (epigallocatechin gallate) being the dominant catechin at 50–70%.

For formulator specification: EGCG 50% Green Tea Extract from Herbuno delivers catechin as part of the full catechin spectrum. A serving of 200–400 mg of EGCG 50% extract provides approximately 10–30 mg pure catechin alongside 100–200 mg EGCG. For catechin-standardised preparations, grape seed OPC extract (which contains catechin as a monomer alongside oligomeric procyanidins) or isolated catechin ≥98% from specialty green tea fractionation are alternative options.

Catechin stability in supplement formulations requires attention to oxidation: catechol B-rings are susceptible to auto-oxidation, particularly at alkaline pH and elevated temperature. Encapsulation with nitrogen atmosphere, antioxidant co-formulation (vitamin C, rosemary extract), and pH 4–6 maintenance protect catechin integrity during manufacturing and shelf life. Green tea extracts with added ascorbic acid are a standard commercial stability formulation.

Catechin can chelate non-haem iron, reducing iron absorption when consumed with iron-rich foods. This is a consideration for iron-deficient populations or individuals on iron supplementation; separating green tea extract and iron supplements by 1–2 hours is practical guidance. No other clinically significant drug interactions are documented for catechin at supplement doses.

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Frequently Asked Questions — Catechin

What is the structural difference between catechin and epicatechin?
Catechin and epicatechin are stereoisomers at C-3 and C-2 — both are (2R,3S) and (2R,3R) configurations respectively (or the natural enantiomers: (+)-catechin is 2R,3S; (-)-epicatechin is 2R,3R). The C-3 stereochemistry changes the orientation of the C-ring hydroxyl, significantly affecting which enzymes and receptors the molecule binds and the kinetics of gut absorption. Epicatechin predominates in cocoa; catechin is the thermodynamic precursor to procyanidin oligomers (B-type dimers). Both are pharmacologically active and co-occur in most catechin-rich plants.

How does catechin contribute to OPC (oligomeric proanthocyanidin) formation?
OPCs (procyanidins) form when catechin and epicatechin monomers condense head-to-tail via C4–C8 or C4–C6 interflavanyl bonds under oxidative plant conditions. The simplest dimer (procyanidin B2 = epicatechin-epicatechin) and the catechin-epicatechin dimer (procyanidin B1) are the most abundant. OPCs in grape seed, pine bark, and cocoa derive from these same catechin/epicatechin building blocks. Catechin monomer and OPC polymers have overlapping but complementary bioactivities.

Which Herbuno products provide catechin as part of the flavan-3-ol spectrum?
EGCG 50% Powder (Green Tea Extract, standardised Camellia sinensis) provides catechin alongside EGCG, EGC, ECG, and epicatechin in the natural catechin distribution of green tea. Cocoa Extract Polyphenols 12% (from Theobroma cacao) delivers epicatechin as the dominant flavan-3-ol with catechin as a co-occurring monomer. Grape Seed Extract Powder 95% OPC provides catechin and epicatechin monomers as the molecular units of the OPC polymer matrix.

Does green tea catechin interact with caffeine in supplement formulations?
Yes — this is a deliberate and beneficial interaction. Catechin and caffeine interact synergistically for thermogenesis and fat oxidation: catechin inhibits catechol-O-methyltransferase (COMT), reducing norepinephrine breakdown and extending thermogenic beta-adrenergic signalling that caffeine initiates. Clinical studies of green tea extract for weight management consistently show greater efficacy when the full catechin-caffeine matrix is preserved versus decaffeinated preparations. For weight management formulations, maintaining catechin-caffeine synergy is a key specification consideration.

Related compounds: Epicatechin, EGCG, Procyanidins, Taxifolin

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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