Named Bioactive Compounds · Compound
Gallocatechin (Flavonoid)
Moderate Evidenceflavonoid
Hermetica Superfood Encyclopedia
Gallocatechin is a flavan-3-ol flavonoid found in tea leaves that exhibits antioxidant activity through direct free radical scavenging mechanisms. This polyphenolic compound chelates metal ions and may reduce cellular oxidative stress, though evidence remains preliminary from laboratory studies.
Gallocatechin is a flavan-3-ol flavonoid (C15H14O7) characterized by multiple hydroxy groups, predominantly found in green tea leaves (Camellia sinensis) and isolated from plants like Gelsemium elegans. First isolated from green tea in 1934 by Michiyo Tsujimura, it is typically obtained through standard polyphenolic isolation techniques, yielding a solid or powder with ≥95% HPLC purity.
No human clinical trials, randomized controlled trials (RCTs), or meta-analyses for gallocatechin alone are available in the research literature. Available studies focus solely on in vitro antioxidant properties, showing reduced lipid peroxidation inhibition compared to catechin, with no PubMed PMIDs provided for human studies.
No clinically studied dosage ranges have been established for gallocatechin in any form (extract, powder, or standardized preparation). Human trials determining safe and effective doses are absent from the scientific literature. Consult a healthcare provider before starting any new supplement.
Gallocatechin (GC) is a flavan-3-ol flavonoid (molecular formula: C₁₅H₁₄O₇, MW: 306.27 g/mol) and is an epimer of epigallocatechin (EGC). It is not a macronutrient source itself but rather a bioactive polyphenolic compound. Key profile details: • Structure features a pyrogallol-type B-ring (trihydroxylated) and a trans-configuration at the C2-C3 position, distinguishing it from its cis-epimer EGC. • Found naturally in green tea (Camellia sinensis) at concentrations typically ranging from ~1–5 mg/g dry leaf weight, significantly lower than epigallocatechin gallate (EGCG) or epicatechin (EC). Also present in certain fruits (persimmons, bananas), legumes, and cocoa at trace levels. • Contains no appreciable vitamins, minerals, protein, fat, or fiber — its biological relevance is entirely as a phenolic bioactive. • Bioactive concentrations in brewed green tea infusions: approximately 5–20 mg/L depending on brewing conditions, tea variety, and steeping time. • Possesses six phenolic hydroxyl groups contributing to its electron-donating and radical-scavenging capacity (three on the B-ring, two on the A-ring, one on the C-ring). • Bioavailability is considered low-to-moderate: oral absorption in humans is limited (estimated <10% of ingested dose reaches systemic circulation), subject to extensive Phase II conjugation (glucuronidation, sulfation, methylation) in the intestinal wall and liver. Plasma concentrations after typical tea consumption are in the nanomolar-to-low-micromolar range. • Undergoes colonic microbial metabolism to smaller phenolic acids (e.g., 5-(3',4',5'-trihydroxyphenyl)-γ-valerolactone and related ring-fission metabolites), which may contribute to downstream biological effects. • Relative antioxidant capacity (ORAC/TEAC assays): generally lower than EGCG and EGC but comparable to or slightly less than catechin (C) in certain in vitro radical scavenging models; its trihydroxylated B-ring provides stronger chelation potential than catechin's dihydroxylated B-ring. • Metal ion chelation: capable of chelating Fe²⁺, Cu²⁺, and other transition metal ions at the ortho-dihydroxy/trihydroxy sites, potentially reducing Fenton-reaction-driven oxidative damage. • Stability: less stable than epicatechin under neutral-to-alkaline pH; prone to auto-oxidation and epimerization to EGC under heat and elevated pH conditions, which is relevant for food processing and supplement formulation. • No established Dietary Reference Intake (DRI) or Recommended Daily Allowance (RDA); no specific tolerable upper intake level has been defined for gallocatechin individually.
Gallocatechin functions as an antioxidant by donating electrons from its hydroxyl groups to neutralize reactive oxygen species including superoxide anions and hydroxyl radicals. The compound's trihydroxyphenyl structure enables chelation of transition metal ions like iron and copper, preventing metal-catalyzed oxidative reactions. These mechanisms collectively reduce lipid peroxidation and protect cellular components from oxidative damage.
Current evidence for gallocatechin's health effects comes exclusively from in vitro mechanistic studies examining its antioxidant capacity and metal chelation properties. Laboratory research demonstrates free radical scavenging activity, but no human clinical trials have evaluated gallocatechin as an isolated compound. Most studies focus on tea extracts containing multiple catechins rather than gallocatechin specifically. The preliminary nature of available data limits conclusions about therapeutic efficacy in humans.
No specific safety data exists for isolated gallocatechin supplementation since it has not been studied independently in human trials. As a tea constituent, gallocatechin is generally considered safe when consumed as part of normal tea intake. Potential interactions may occur with iron absorption due to its metal chelation properties. Pregnant and breastfeeding women should exercise caution with concentrated flavonoid supplements pending safety research.
