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Gte7.5
Green Tea Extract Research
Likely helps
299 peer-reviewed studies
What the evidence says
Likely helps
Green Tea Extract appears to help in 4 of 4 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 1,389 participants.
Based on 299 studies · 61 meta-analyses · 177 RCTs · 74,434 total participants
Confidence
High confidence
What the studies found
4helped· 295 more without graded effect data
By outcome
Therapeutic & clinical
Too few graded studies116 studies
Weight managementModest fat oxidation and thermogenesis · 4-12 weeks
Too few graded studies48 studies
Heart & blood pressureCatechins improve lipid profiles and endothelial function · 8-12 weeks
Cholesterol & lipidsCatechins improve lipid profiles and endothelial function · 8-12 weeks
Too few graded studies18 studies
Women's healthA PCOS meta-analysis found weight loss, not hormone changes. Estrogen metabolism was not measured · 4-8 weeks
Too few graded studies15 studies
Liver health
Too few graded studies9 studies
InflammationNo anti-inflammatory benefit has been shown. The evidence here concerns fat oxidation · 4-8 weeks
Too few graded studies8 studies
Safety profile
Too few graded studies7 studies
Depression & mood
Too few graded studies2 studies
Longevity & agingGreen tea drinking is linked with lower cardiovascular and all-cause mortality in cohort studies. A matcha trial in older adults with cognitive decline found no main cognitive benefit · Ongoing
Too few graded studies2 studies
Immune support
Too few graded studies1 study
By the numbers
Pulled from 35 studies with measurable effects
Likely real effects
100%
across studies
People studied
74k
typical study: 1389 people
Strongest designs
238
61 pooled, 177 randomised
Showed benefit
100%
4/4 studies
How long studies ran
1–3 months
4
3+ months
1
Populations Studied
General population3
Adults2
Diverse populations1
Adults with obesity markers1
Active research area
99 studies in the last 5 years · Latest meta-analysis: 2026
199720112026
1Office blood pressure reductionMeta-AnalysisCited 10×n=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)
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.
5Influenza preventionMeta-AnalysisCited 9×n=5,048 · very large study2021
In plain English: To confirm the findings before implementation, longitudinal clinical trials with specific doses of green tea consumption are warranted.
Rawangkan A et al. · Molecules (Basel, Switzerland) (2021)
Large benefit
← WorseNo effectBetter →
Likely real
Similarly, in three cohort studies with 2,223 participants treated with GTCs, there were also statistically significant effects (RR 0.52, 95%CIs 0.35-0.77, P = 0.001) with very low evidence of heterogeneity (I2 = 3%, P = 0.358).
Additionally, the overall effect in the subgroup analysis of gargling and orally ingested items (taking capsules and drinking) showed a pooled RR of 0.62 (95% CIs 0.49-0.77, P = 0.003) without heterogeneity (I2= 0%, P = 0.554).
There were no obvious publication biases (Egger's test (P = 0.138) and Begg's test (P = 0.103)).
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)
Meta-analysis of 14 randomised trials of six polyphenol products for preventing or managing preeclampsia.
In one trial of 349 women with preeclampsia, adding EGCG to nifedipine shortened the time to blood pressure control by about 14 minutes and lengthened the time to the next hypertensive crisis by about 3 hours (low certainty).
No differences were seen for other outcomes, and evidence on clinical and adverse effects is limited.
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.