Skip to main content
Evidence-Based Supplement Research
Evidence-Based Supplement Research
Pillser
Search
Sign UpLog In

green tea

What does the research say about green tea?

4 health outcomes synthesised

Green tea has been researched for its potential effects on four health outcomes, including weight management and markers of cardiovascular health. The strongest evidence, supported by four meta-analyses each, points to modest beneficial effects on reducing body mass index (BMI) and body weight, primarily in overweight or obese adults. Doses and forms of green tea were not consistently reported across studies, making specific intake recommendations unavailable from the current research.

Strongest evidence

The research base for green tea is strongest for reducing body mass index (BMI) and reducing body weight, both supported by evidence of moderate strength across 4 meta-analyses each. For BMI, 3 of 4 meta-analyses reported statistically significant beneficial effects, with effect sizes ranging from small to large across studies. For body weight, 3 of 4 studies found beneficial effects, including a small weight reduction of −0.74 kg in one meta-analysis and a moderate benefit in a large systematic review of adults with MASLD (n=4,572). No consistent dose or form data were available for either outcome.

Mixed or weaker evidence

Evidence for reducing blood cholesterol is also moderate (4 meta-analyses), with 3 showing small beneficial effects and 1 showing no significant effect in overweight/obese individuals. For reducing triglyceride levels, the evidence is weaker (low strength, 3 studies): only 1 study reported a moderate beneficial effect (short-term, <8 weeks, doses <3000 mg/day), while 2 found neutral effects. Conclusions for triglycerides are considered preliminary due to the small evidence base.

Effective dose patterns

Across syntheses, doses were not consistently reported, limiting cross-cutting dose insights. The only specific dose finding comes from one triglyceride meta-analysis, which observed a beneficial effect at doses below 3000 mg/day of green tea extract. No other outcome had sufficient dose data to identify effective ranges.

Population insights

Most evidence comes from studies in overweight or obese adults and postmenopausal women. For body weight and BMI, benefits were noted in these groups, but one meta-analysis in postmenopausal women found no significant effect on body weight, suggesting the effect may not generalize to all populations. No consistent population-specific patterns emerged for cholesterol or triglycerides.

Notable caveats

  • The clinical literature on green tea is subject to publication bias (null-result studies less likely to be published).
  • Evidence bases are small (3–4 studies per outcome), so conclusions should be considered preliminary.
  • Doses and forms were not consistently reported across studies, making specific dose recommendations unavailable.
  • For several outcomes, one meta-analysis showed no significant effect, indicating possible heterogeneity in results.

Frequently asked

  • What is green tea good for according to research?
    Current research — based on 4 meta-analyses each — suggests green tea may have modest beneficial effects on reducing BMI and body weight, primarily in overweight or obese adults. There is also moderate evidence for small improvements in total cholesterol, while evidence for lowering triglycerides is weaker and preliminary.
  • What dose of green tea is typically used in studies?
    The majority of studies did not consistently report doses or forms of green tea, so no specific dose range can be identified for most outcomes. One meta-analysis on triglycerides found a beneficial effect at doses below 3000 mg/day of green tea extract, but this was based on short-term studies (<8 weeks).
  • Who benefits most from green tea?
    Most of the research has been conducted in overweight or obese adults and postmenopausal women. Benefits for weight-related outcomes were most often observed in these groups, though one meta-analysis in postmenopausal women found no significant effect on body weight, suggesting results may not apply to all populations.
  • Are there caveats or limitations in the research on green tea?
    Yes. The evidence base is small (3–4 studies per outcome), and conclusions should be considered preliminary. The clinical literature is subject to publication bias, meaning null results are less likely to be published. Doses and forms were not consistently reported, making specific recommendations unavailable.
  • Does green tea help with weight loss?
    Moderate evidence from 4 meta-analyses shows that green tea may produce small reductions in body weight (e.g., −0.74 kg in one meta-analysis) and BMI, particularly in overweight or obese adults. However, one meta-analysis in postmenopausal women found no significant effect on body weight, and the optimal dose is not yet established.
  • Does green tea lower cholesterol?
    Of 4 meta-analyses, 3 reported small beneficial effects on total cholesterol, while 1 found no significant effect. The evidence is of moderate strength but limited by small study numbers and inconsistent reporting of doses. The most studied populations were postmenopausal women and overweight or obese individuals.

Most-studied combinations with green tea

most supplement research is combination research
Also studied with:Turmeric (2), Resveratrol (2), Oolong Tea (2), Quercetin (2), Thistle (2), Berberine (3), Vitamin D (3), Vitamin E (2), Garlic (2), Chicory (2)

  • Brain Awake

    By Irwin Naturals

    4.4 (271 reviews)
    In Stock
    Available From
    Available From
    MerchantPriceStockAction
    Amazon
    $-
    		Out
    iHerb
    $21.99
    		In
    Vitacost
    $21.99
    		In
    Vitamin Shoppe
    $-
    		Out

  • Pine Bark Extract

    By NOW Foods

    4.6 (1.7K reviews)
    Out of Stock
    Available From
    Available From
    MerchantPriceStockAction
    Amazon
    $-
    		Out
    iHerb
    $15.91
    		In
    Vitacost
    $-
    		Out
    Vitamin Shoppe
    $-
    		Out

  • Thermogenic Complex

    By Swanson

    4.6 (33 reviews)
    Out of Stock
    Available From
    Available From
    MerchantPriceStockAction
    Amazon
    $-
    		Out
    iHerb
    $12.09
    		In
    Vitacost
    $-
    		Out
    Vitamin Shoppe
    $-
    		Out

  • Detox Formula

    By Vital Nutrients

    4.8 (5 reviews)
    In Stock
    Available From
    Available From
    MerchantPriceStockAction
    Amazon
    $-
    		Out
    iHerb
    $27.90
    		In
    Vitacost
    $-
    		Out
    Vitamin Shoppe
    $-
    		Out

  • Collagenic Burn

    By Obvi

    4.2 (145 reviews)
    Out of Stock
    Available From
    Available From
    MerchantPriceStockAction
    Amazon
    $-
    		Out
    iHerb
    $29.99
    		In
    Vitacost
    $-
    		Out
    Vitamin Shoppe
    $29.99
    		In

  • Thermo Green Tea

    By NOW Foods

    4.6 (496 reviews)
    In Stock
    Available From
    Available From
    MerchantPriceStockAction
    Amazon
    $15.30
    		In
    iHerb
    $15.30
    		In
    Vitacost
    $-
    		Out
    Vitamin Shoppe
    $-
    		Out
Back to top