Supplement

Green Tea Extract (EGCG)

Also known as EGCG, Catechins, Camellia sinensis

Concentrated catechin polyphenols from Camellia sinensis, chiefly epigallocatechin gallate (EGCG); modestly increases thermogenesis and fat oxidation when combined with caffeine, and provides broad antioxidant activity.

2linked conditions

20linked studies

On this pageEvidence Availability Outcomes & conditions →

Evidence

What the research actually shows

We link to relevant studies and leave interpretation to you and your healthcare professional.

Evidence analytics

Where the evidence is concentrated

Number of audited published findings for Green Tea Extract (EGCG) by condition. Drill into a pair page for the full breakdown.

Putative uses

Where people report using it and what trials suggest

Moderate evidenceLDL-cholesterol reduction
Moderate evidenceBlood pressure (small effect)
Moderate evidenceFat oxidation (acute, modest)

Where the evidence is negative

Common claims the trials do not support

Weight-loss meta-analyses show trivial (~1 kg) effects at best.
Cancer prevention trials null.
EFSA flagged liver injury risk above ~800 mg/day EGCG, especially fasted.

Concentrated EGCG catechin; beverage-level intake is safe, but high-dose extracts carry a liver warning and benefits are modest.

Safety notes: Take with food; discontinue if nausea/dark urine. Caffeine content adds stimulation. Interacts with some antihypertensives.

Evidence grades reflect study quality and consistency, not marketing claims.

20studies referenced

14journals

2012–2026publication range

01Effects of Green Tea Extract Supplementation on Inflammatory Cytokines Among Postmenopausal Women with Overweight or Obesity-A Secondary Analysis of a Randomized Controlled TrialCunningham A, et al. · Nutrients · 2026PMID 41515260 ↗02Effectiveness of Herbal Medicines with Anti-Inflammatory, Antimicrobial, and Antioxidant Properties in Improving Oral Health and Treating Gingivitis and Periodontitis: A Systematic ReviewMalcangi G, et al. · Nutrients · 2025PMID 40077632 ↗03Effects of 2-year cocoa extract supplementation on inflammaging biomarkers in older US adults: findings from the COcoa Supplement and Multivitamin Outcomes Study randomised clinical trialLi S, et al. · Age and ageing · 2025PMID 40966617 ↗04Anti-Inflammatory, Antithrombotic and Antioxidant Efficacy and Synergy of a High-Dose Vitamin C Supplement Enriched with a Low Dose of Bioflavonoids; In Vitro Assessment and In Vivo Evaluation Through a Clinical Study in Healthy SubjectsChrysikopoulou V, et al. · Nutrients · 2025PMID 40871671 ↗05Does green tea catechin enhance weight-loss effect of exercise training in overweight and obese individuals? a systematic review and meta-analysis of randomized trials

Search PubMed ↗Find clinical trials ↗

What trials found, in numbers

Summaries of published trial results for this compound, grouped by condition. Numbers are reported exactly as the researchers published them — we never calculate or convert.

How to read this table

Benefit: What the trial saw happen: whether the measured outcome moved in the helpful direction in that one study (the tag on each row: “Benefit seen”, “No clear benefit” or “Unclear”). It is a study result — not advice, and not a promise it will work for you.
Evidence: How strong the research behind that result is. A meta-analysis pools many studies (strongest); a systematic review collates them; an RCT tests against a control (placebo); observational studies only watch — they can suggest, not prove.
Effect size: How large the measured change was, exactly as the researchers published it. “No number reported” means the abstract gave no effect size — we never invent one.

In short: benefit is what was observed; evidence is how much you should trust the observation. A “Benefit seen” tag on a weak study counts for far less than the same tag on a meta-analysis.

Inflammation (1 outcome)

Outcome measured	What trials found	Effect size	People studied	Duration	Type of evidence	Study
plasma C-reactive protein concentrations	Green tea catechins showed no significant effect on plasma CRP vs control in 11 RCT arms. (95% CI, -0.225 to 0.395; P = 0.592)No clear benefit	0.085 mg/L	11 RCTs arms	<8 wk and ≥8 wk	Meta-analysis · 2015	PMID 26233863

Important: This page reflects observational, aggregate-only community reporting and independent published research. It is not medical advice, and it does not claim any compound treats, cures, or is effective for any condition. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or treatment.

Outcomes & conditions

Why people look into Green Tea Extract (EGCG) — and what they report

Associated conditions and community-reported outcomes, wrapped together on one page. Aggregates appear only once enough reports arrive.

Outcomes & conditions →

Availability

Where to get Green Tea Extract (EGCG) (UK)

How this compound is sold in the UK, and where our readers typically find it.

Retailer search links — we may earn commission on purchases at no cost to you. Commission never affects our evidence ratings.

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