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Gte7.5
Green Tea Extract Research
Likely helps
297 peer-reviewed studies
What the evidence says
Likely helps
Green Tea Extract appears to help in 5 of 6 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1997–2026 with a typical study size of 371 participants.
Based on 297 studies · 63 meta-analyses · 177 RCTs · 71,805 total participants
Confidence
High confidence
What the studies found
5helped1unclear· 291 more without graded effect data
By outcome
Therapeutic & clinical
Mostly mechanism / observational115 studies
Weight managementModest fat oxidation and thermogenesis · 4-12 weeks
Mostly mechanism / observational47 studies
Heart & blood pressureCatechins improve lipid profiles and endothelial function · 8-12 weeks
InflammationIncreased fat oxidation and metabolic rate · 4-8 weeks
Mostly mechanism / observational9 studies
Liver health
Mostly mechanism / observational7 studies
Safety profile
Mostly mechanism / observational7 studies
Depression & mood
Too few graded studies2 studies
Longevity & agingAntioxidant protection and cardiovascular support · Ongoing
Too few graded studies2 studies
Immune support
Too few graded studies1 study
By the numbers
Pulled from 43 studies with measurable effects
Likely real effects
88%
across studies
People studied
72k
typical study: 371 people
Strongest designs
240
63 pooled, 177 randomised
Showed benefit
83%
5/6 studies
How long studies ran
1–3 months
4
3+ months
1
Populations Studied
Adults3
General population3
Diverse populations1
Adults with obesity markers1
Active research area
97 studies in the last 5 years · Latest meta-analysis: 2026
199720112026
1Office blood pressure reductionMeta-Analysisn=5,205 · very large study2025
In plain English: Flavan-3-ol-rich foods considerably reduce elevated BP and improve endothelial function independent of blood pressure supporting their use for cardiovascular prevention.
Lagou V et al. · European journal of preventive cardiology (2025)
Noticeable benefit
← WorseNo effectBetter →
Flavan-3-ol interventions included epicatechin, epigallocatechin-gallate, cocoa products, tea, grape extract, and apples delivering 586 mg (95% CI 510, 662) total flavan-3-ols.
Interventions decreased office (-2.8 [95% CI -3.9, -1.7]/-2.0 [-2.6, -1.3] mmHg) and 24 h-ambulatory BP (-3.7 [-5.8, -1.6]/-2.6 [-4.5, -0.8] mmHg) after chronic repetitive consumption.
Flow-mediated dilation increased after acute (+2.0% [1.6, 2.3]) and repetitive (+1.7% [1.3, 2.2]) consumption independent of BP.
5Preeclampsia managementMeta-Analysisn=349 · medium study2025
In plain English: ECGC and resveratrol supplements have been investigated for potential effects in managing clinical signs and symptoms of preeclampsia; however, evidence on the clinical and adverse effects of polyphenols is limited and uncertain.
Nguyen PY et al. · BJOG : an international journal of obstetrics and gynaecology (2025)
ECGC and resveratrol supplements have been investigated for potential effects in managing clinical signs and symptoms of preeclampsia; however, evidence on the clinical and adverse effects of polyphenols is limited and uncertain.
6Cancer incidenceMeta-Analysisn=1,795 · large study2020
In plain English: Overall, findings from experimental and nonexperimental epidemiological studies yielded inconsistent results, thus providing limited evidence for the beneficial effect of green tea consumption on the overall risk of cancer or on specific cancer sites.
Filippini T et al. · The Cochrane database of systematic reviews (2020)
No clear effect
← WorseNo effectBetter →
For incident prostate cancer, the summary risk ratio (RR) in the green tea-supplemented participants was 0.50 (95% confidence interval (CI) 0.18 to 1.36), based on three studies and involving 201 participants (low-certainty evidence).
The summary RR for gynaecological cancer was 1.50 (95% CI 0.41 to 5.48; 2 studies, 1157 participants; low-certainty evidence).
No evidence of effect of non-melanoma skin cancer emerged (summary RR 1.00, 95% CI 0.06 to 15.92; 1 study, 1075 participants; low-certainty evidence).
In plain English: Both in vitro and in vivo studies have demonstrated that the possible anticancer mechanisms are the inhibition on proliferation, anti-angiogenesis, induction of apoptosis, suppression on metastasis, inhibition on cancer stem cells, and modulation on gut microbiota.
Xu XY et al. · Critical Reviews in Food Science and Nutrition (2020)
Epidemiological studies have shown that the consumption of tea is inversely associated with the risk of several cancers.
The anticancer actions of tea are mainly attributed to tea polyphenols, such as epigallocatechin-3-gallate and theaflavins.
Clinical trials have elucidated that intervention of tea phytochemicals is effective in the prevention of several cancers.
11Oncological treatment supportSystematic Reviewn=371 · medium study2023
In plain English: Due to limitations, further studies with higher methodological quality and larger sample sizes are needed.
Wiese F et al. · International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition (2023)
Likely real
T0: 9.9±8.5 ng/ml, T1: 10.0±9.0 ng/ml; p=0.04), whereas in a second study only a trend was seen.
Radiotherapy-induced diarrhea was lower in the green tea intervention group compared to placebo (1 study; N=42; week 4+5: without diarrhea p=0.002).
Conclusions: The studies suggest that EGCG is as effective as a local antibiotic in malodorous control and improvement of QoL of fungating malignant wounds.