Hermetica Superfood Encyclopedia
The Short Answer
Epicatechin gallate (ECG) is a catechin flavanol found in green tea that exhibits antioxidant and metabolic properties. ECG works primarily through free radical scavenging and modulation of cellular signaling pathways involved in fat metabolism.
CategoryNamed Bioactive Compounds
GroupCompound
Evidence LevelModerate
Primary Keywordepicatechin gallate benefits
Synergy Pairings3
Epicatechin gallate — botanical close-up
Health Benefits
Origin & History
Natural habitat
Epicatechin gallate (ECG) is a flavan-3-ol polyphenol formed by the esterification of gallic acid with epicatechin, naturally abundant in green tea (Camellia sinensis) leaves and found in trace amounts in cocoa and grapes. It is typically extracted via hot water infusion or solvent extraction from green tea leaves, followed by chromatographic purification, representing 5-10% of total catechins in standardized extracts.
“ECG has been consumed as a component of green tea in Traditional Chinese Medicine since approximately 2737 BCE (legend of Emperor Shennong) for digestion, detoxification, and longevity. In Japanese Kampo medicine (from ~6th century CE), green tea catechins were used to treat fatigue, inflammation, and cognitive decline, though isolated ECG was never used traditionally.”Traditional Medicine
Scientific Research
Human clinical evidence for isolated ECG is limited, as most research investigates green tea catechins collectively with ECG as a minor component (5-10%). A 2016 meta-analysis of 15 RCTs (n=1,243) examined green tea catechins at 200-1,000 mg/day doses (PMID: 26932635), while specific trials include a 2009 RCT in 60 overweight women (PMID: 19597519) and a 2020 RCT in 80 type 2 diabetes patients (PMID: 32067869).
Preparation & Dosage
Traditional preparation
Clinically studied doses range from 40-100 mg/day ECG as part of standardized green tea extracts (200-800 mg/day total catechins), typically standardized to 5-10% ECG content. Beverage form provides 5-15 mg ECG from 3-5 cups of green tea daily. No isolated ECG dosing has been established. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
Epicatechin gallate (ECG) is a pure bioactive polyphenolic compound, not a food source, so macronutrient and micronutrient framing is not applicable. Molecular weight: 442.37 g/mol. Chemical class: Flavan-3-ol ester (catechin esterified with gallic acid at the 3-position). Typical concentrations in dietary sources: green tea leaves contain approximately 10–50 mg ECG per gram dry weight; brewed green tea contains approximately 15–90 mg ECG per 200–250 mL cup depending on brewing conditions and tea variety. In green tea extracts used in clinical trials, ECG typically constitutes 10–30% of total catechin content. Structurally distinct from EGCG (epigallocatechin gallate) by absence of one hydroxyl group on the B-ring. Bioavailability is limited and variable: peak plasma concentration (Cmax) reached approximately 1–2 hours post-ingestion; absolute bioavailability estimated at less than 5% due to extensive first-pass metabolism, limited intestinal absorption, and colonic microbial degradation into smaller phenolic metabolites (e.g., 3-O-methyl-ECG, phenylvalerolactones, and phenylpropionic acid derivatives). Protein binding in plasma is high (>80%). Food matrix effects: absorption is reduced when consumed with milk proteins (casein binding) and enhanced slightly in a fasted state. No fiber, vitamin, or mineral content as it is an isolated compound.
How It Works
Mechanism of Action
Epicatechin gallate functions as a potent antioxidant by scavenging reactive oxygen species and chelating metal ions. ECG modulates key metabolic enzymes including catechol-O-methyltransferase (COMT) and activates AMP-activated protein kinase (AMPK) pathways. The compound also inhibits fatty acid synthase and promotes thermogenesis through norepinephrine signaling enhancement.
Clinical Evidence
Clinical evidence for epicatechin gallate primarily comes from green tea catechin mixture studies rather than isolated ECG research. A 12-week randomized controlled trial with 87mg daily ECG (as part of catechin blend) showed 1.1kg weight reduction in overweight women. Meta-analyses of 15 RCTs demonstrate modest cardiovascular benefits from catechin mixtures containing ECG. Evidence quality remains moderate due to limited isolated ECG studies and variable dosing protocols.
Safety & Interactions
Epicatechin gallate appears well-tolerated at typical supplemental doses up to 300mg daily. ECG may interact with iron absorption due to its metal-chelating properties and should be taken separately from iron supplements. The compound may potentiate blood-thinning medications due to antiplatelet effects. Pregnant and breastfeeding women should avoid concentrated ECG supplements due to limited safety data.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
(-)-epicatechin-3-gallateECGepicatechin 3-O-gallate(-)-epicatechin 3-gallate3'-galloylepicatechinepicatechin-3-O-gallate(-)-epicatechin gallate
Frequently Asked Questions
How much epicatechin gallate is in green tea?
Green tea contains approximately 12-25mg of epicatechin gallate per cup, varying by brewing time and tea quality. Concentrated green tea extracts provide 50-150mg ECG per serving.
What is the difference between epicatechin and epicatechin gallate?
Epicatechin gallate contains an additional gallic acid group attached to epicatechin, making it more stable and potent as an antioxidant. ECG has stronger enzyme inhibitory effects than simple epicatechin.
When should I take epicatechin gallate supplements?
Take epicatechin gallate 30-60 minutes before meals for optimal absorption and metabolic benefits. Avoid taking with iron-rich foods or supplements as ECG can reduce iron absorption.
Can epicatechin gallate cause side effects?
ECG is generally well-tolerated but may cause mild nausea, stomach upset, or headaches at high doses above 300mg daily. Taking with food can minimize gastric irritation.
How long does it take for epicatechin gallate to work?
Acute antioxidant effects occur within 2-4 hours of consumption, while metabolic benefits like weight loss typically require 8-12 weeks of consistent daily supplementation at therapeutic doses.
Does epicatechin gallate interact with blood pressure or cholesterol medications?
Epicatechin gallate may have mild additive effects with blood pressure or cholesterol-lowering medications due to its cardiovascular benefits shown in clinical studies. If you are taking antihypertensive or statin medications, consult your healthcare provider before starting epicatechin gallate supplements to avoid potential interactions or over-treatment. Most dietary sources of epicatechin gallate (like green tea) are safe alongside medications, but supplement doses warrant professional review.
Is epicatechin gallate safe during pregnancy and breastfeeding?
Clinical safety data for epicatechin gallate supplementation during pregnancy and breastfeeding is limited, though moderate green tea consumption (2–3 cups daily) is generally considered acceptable. High-dose epicatechin gallate supplements are not recommended during pregnancy or breastfeeding without explicit medical approval due to insufficient safety evidence. Pregnant and nursing individuals should consult their healthcare provider before using epicatechin gallate supplements.
What does the research actually show about epicatechin gallate for weight loss?
Clinical trials demonstrate that epicatechin gallate from green tea catechins (at approximately 87 mg daily) produced modest weight reduction of about 1.1 kg over 12 weeks in overweight women, representing moderate-quality evidence. This means epicatechin gallate is not a standalone weight loss solution but may provide a small supportive effect when combined with diet and exercise. Results are far less dramatic than pharmaceutical weight-loss interventions and require consistent long-term use to observe benefits.
Explore the Full Encyclopedia
7,400+ ingredients researched, verified, and formulated for optimal synergy.
Browse IngredientsThese statements have not been evaluated by the Food and Drug Administration. This content is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease.
hermetica-encyclopedia-canary-zzqv9k4w epicatechin-gallate curated by Hermetica Superfoods at ingredients.hermeticasuperfoods.com and licensed CC BY-NC-SA 4.0 (non-commercial share-alike, attribution required)
