Gallocatechin — GC (Flavan-3-ol · Antioxidant · Anti-inflammatory)

Compound	Gallocatechin (GC)
Chemical class	Polyphenol — Flavan-3-ol
CAS	3371-27-5
Primary source	Camellia sinensis (green tea), Vitis vinifera (grape)
Key applications	Antioxidant, anti-inflammatory, lipid modulation
Claim strength	Moderate
Typical form	Green tea extract (minor catechin co-constituent)

Name origin: Gallocatechin denotes a catechin with a trihydroxylated (pyrogallol-type) B-ring — the “gallo” prefix reflects the galloyl group hydroxylation pattern. It is the non-gallated, non-epimeric counterpart to epigallocatechin (EGC) in the green tea catechin family. Traditional use: Gallocatechin shares the general traditional use context of green tea and grape-derived preparations. It has not been individually identified in traditional therapeutic practice. Research trajectory: Gallocatechin is the least studied of the four principal green tea catechins (EGCG, ECG, EGC, GC). Its trihydroxylated B-ring confers high antioxidant capacity; specific mechanistic and clinical data are limited compared to EGCG. Commercial source: Co-delivered via green tea extract; isolated gallocatechin is available in limited quantities as a research-grade material.

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Evidence for Gallocatechin Applications

Antioxidant capacity: The trihydroxylated B-ring of gallocatechin provides high radical-scavenging activity in DPPH, ABTS, and FRAP assays — superior to catechin and epicatechin but comparable to EGC. Metal chelation capacity is also documented. Contributes to the overall antioxidant profile of green tea extract. Claim strength: Moderate.

Anti-inflammatory signalling: Gallocatechin inhibits COX-2 and NF-κB in cell-based models at low micromolar concentrations. Anti-inflammatory potency is broadly similar to other non-gallated catechins. Preclinical in vivo anti-inflammatory data are limited. Claim strength: Moderate.

Lipid metabolism: Gallocatechin inhibits pancreatic lipase in vitro, a mechanism shared with other catechins and relevant to fat digestion modulation. Activity is lower than gallated forms (EGCG, ECG) due to absence of the gallate ester. Claim strength: Emerging.

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Dosage & Formulator Specification

Gallocatechin constitutes approximately 2–8% of total catechin content in standard green tea extract depending on variety and processing. In a typical 400 mg EGCG 50% extract dose, gallocatechin content is 10–40 mg. No dedicated clinical dose for gallocatechin has been established.

Formulators do not typically specify gallocatechin as a primary active. It is best characterised as a contributing antioxidant component of the full catechin profile delivered by green tea extract. Request a full catechin panel CoA from Herbuno to confirm gallocatechin quantification alongside EGCG, ECG, EGC, and epicatechin.

Stability of gallocatechin is similar to other non-gallated catechins — moderately sensitive to oxidation and alkaline pH. More stable than EGCG under acidic beverage conditions due to absence of the easily hydrolysable gallate ester.

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Frequently Asked Questions — Gallocatechin

What is the difference between gallocatechin and epigallocatechin?
Epigallocatechin (EGC) is the C-3 epimer of gallocatechin — the same trihydroxylated B-ring structure with inverted C-3 stereochemistry. EGC is more abundant in green tea than GC. EGCG is EGC with an additional C-3 gallate ester. Gallocatechin (GC) is the least abundant and least studied of the four principal green tea catechins.

Why is gallocatechin the least studied green tea catechin?
It is the least abundant catechin fraction in most green tea varieties and lacks the gallate ester that confers superior bioactivity to EGCG and ECG. Research focus has naturally concentrated on the highest-abundance, highest-activity catechins. Gallocatechin is best understood as a contributing member of the catechin ensemble rather than a standalone active.

Does gallocatechin have any unique bioactivity not shared by other green tea catechins?
Not clearly established. Its trihydroxylated B-ring gives it higher antioxidant capacity than dihydroxylated catechins (catechin, epicatechin) but this advantage is shared by EGC. No unique mechanism specific to gallocatechin has been identified in the current literature.

Should I specify gallocatechin content in green tea extract sourcing?
Only for research or premium-tier formulations requiring full catechin characterisation. For standard supplement formulations, specifying EGCG content (with a full catechin panel CoA) is sufficient. Gallocatechin will be quantified in the panel as a minor but real contributor to overall antioxidant activity.

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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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