Green Tea

botanical
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Green tea is made from Camellia sinensis leaves that undergo minimal oxidation. Unlike black tea leaves, they are usually steamed or pan-fired shortly after harvest to preserve their color and polyphenols, particularly catechins. Epigallocatechin gallate (EGCG) is a key catechin whose antioxidant activity is believed to account for many of green tea's health benefits. Green tea has been consumed for thousands of years, originating in China before spreading across Asia. Its flavor and traditional medicinal uses have made it popular as a beverage, while research into its potential benefits has also led to its use in supplements and functional foods. It contains vitamins, minerals, and amino acids alongside its polyphenols. Green tea's bioactive compounds are thought to influence metabolic pathways, support alertness and focus, and promote cardiovascular health. Its caffeine provides mild stimulation, while L-theanine has calming effects. Together, these compounds often produce a sense of relaxed alertness.

Natural sources
Camellia sinensis plant (leaves)

Ingredient forms

No public comparison lists found.

Timing & Intake
AnytimeWith foodAvoid before bedTake with Meals, especially with green tea extracts, to enhance absorption and reduce stomach upset.
While often consumed throughout the day, those sensitive to caffeine should avoid use near bedtime to prevent sleep disruption. Taking green tea, especially concentrated extracts, with food may help reduce potential gastrointestinal discomfort.
Optimal Dosage
Minimum500 mg
Maximum1000 mg
Safety & Toxicity
4 safety notes
  • Pregnant or breastfeeding women should consult a healthcare professional due to caffeine content and potential interactions.
  • Individuals with heart conditions, high blood pressure, or anxiety disorders should use with caution due to its caffeine content.
  • High doses of green tea extract, particularly on an empty stomach, have been rarely associated with liver toxicity. Avoid excessive consumption.
  • May interfere with the absorption of iron if consumed simultaneously.
Goals
Cognitive Support
Cognitive Support
Impact
High effect
Typical dose:250–1000 mg

Green tea naturally contains L-Theanine and caffeine, a well-studied combination that enhances alertness and focus while minimizing jitteriness. Furthermore, its potent antioxidant compounds, like EGCG, help protect brain cells from oxidative stress, supporting long-term cognitive health.

Focuses on
MemoryFocusBrain ProtectionMental Energy
Most relevant for
Adults looking to support daily concentration and maintain cognitive function as they age.

Potential benefits

  • Attention and Alertness.The combination of caffeine and L-theanine in green tea is proven to improve sustained attention, alertness, and task-switching accuracy.
  • Targeted Memory Support.Specific green tea extracts have demonstrated the ability to improve memory composite scores and brain connectivity in adults with subjective memory concerns.
  • Neuroprotective Potential.Unconfirmed. Habitual consumption is associated with a significantly lower risk of dementia and cognitive decline in large-scale observational studies, though a causal link is unproven.

Limitations

  • Inconsistent Clinical Results.Multiple randomized trials have found no significant improvement in general cognitive performance, processing speed, or daily functionality.
  • Demographic Variability.Research indicates that the protective effects against cognitive impairment may vary significantly by sex and individual genetic risk factors.
  • Preparation Differences.The cognitive effects of concentrated extracts, matcha powder, and standard brewed tea are not identical and cannot be assumed to be interchangeable.
Things to consider

Monitor for potential side effects when using concentrated extracts, and note that some cognitive improvements may be transient or depend on concurrent cognitive training.

Study evidence

32 studies

Green Tea is associated with better cognitive health in some population studies, and certain preparations may improve specific attention or memory measures. However, clinical findings are mixed and do not establish that drinking Green Tea or taking its extracts prevents dementia.

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Heart Health
Heart Health
Impact
High effect
Typical dose:250–1000 mg

The catechins in green tea, particularly EGCG, enhance nitric oxide production, which improves vasodilation and blood flow. They also inhibit LDL oxidation and have mild anti-inflammatory effects, contributing to a comprehensive reduction in atherosclerotic risk factors.

Focuses on
Blood PressureCholesterolArtery Health
Most relevant for
Adults seeking to support heart health by managing cholesterol and blood pressure levels through natural polyphenols.

Potential benefits

  • LDL Cholesterol Reduction.Systematic reviews show that green tea and its extracts consistently provide modest reductions in total and LDL cholesterol levels across diverse populations.
  • Blood Pressure Support.Meta-analyses indicate that green tea can help lower both systolic and diastolic blood pressure, with more pronounced effects in individuals with elevated baseline levels.
  • Vascular Function Support.Unconfirmed. Clinical evidence suggests that catechins like EGCG can acutely improve blood vessel dilation, though the long-term persistence of this specific effect remains unproven.

Limitations

  • Inconsistent Lipid Effects.While cholesterol often improves, effects on triglycerides are mixed, with some trials showing slight increases in specific groups like postmenopausal women.
  • Marker vs Disease Prevention.Most clinical data focus on improving risk markers rather than providing direct evidence that green tea or extracts prevent major heart disease events.
  • Sustainability of Benefits.Certain cardiovascular improvements, such as enhanced blood vessel dilation, may be acute and may not be maintained with continuous long-term use.
Things to consider

High-dose extract supplementation may paradoxically increase triglycerides in some postmenopausal women or statin users.

Study evidence

84 studies

Green Tea can modestly improve some cardiovascular risk factors, especially LDL cholesterol and blood pressure, although individual trials vary. Regular tea drinking is also associated with lower cardiovascular risk, but observational findings do not prove that tea or its extracts prevent heart disease.

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Inflammation
Inflammation
Impact
High effect
Typical dose:250–750 mg

Epigallocatechin gallate (EGCG) is the primary active compound in green tea. It helps downregulate the production of pro-inflammatory cytokines like TNF-alpha and IL-6. This provides broad-spectrum support against systemic inflammation driven by metabolic and environmental stressors.

Focuses on
Inflammation LevelsAntioxidantsJoint Inflammation
Most relevant for
Adults seeking to support antioxidant defenses and manage localized inflammation alongside diet and exercise.

Potential benefits

  • Oxidative Marker Modulation.Green tea consistently improves total antioxidant capacity and reduces markers of oxidative damage, which are key drivers of inflammatory signaling.
  • Targeted Cytokine Support.Unconfirmed. The broad anti-inflammatory effect is unproven; while specific signals like TNF-alpha or IL-1beta may decrease in some trials, results for major markers like CRP remain inconsistent or null.
  • Localized Tissue Support.Clinical evidence suggests oral green tea may specifically reduce inflammation within the gut and help protect skin against UV-induced redness.

Limitations

  • Inconsistent Systemic Impact.Large meta-analyses frequently find no significant change in major systemic markers like C-reactive protein (CRP) or Interleukin-6 (IL-6).
  • Context-Specific Benefits.Observable anti-inflammatory effects are often limited to specific populations, such as those with metabolic syndrome, or specific activities like exercise.
  • Preparation Differences.Positive results seen with topical applications or dental treatments cannot be assumed to translate to oral supplements or standard tea consumption.
Things to consider

Supplementation for 8 weeks or less has been associated with a significant increase in C-reactive protein levels in some studies.

Study evidence

16 studies

Green Tea may improve selected inflammatory markers or localized inflammation, but it does not consistently reduce systemic inflammation. Human studies show more reliable changes in antioxidant measures than broad anti-inflammatory benefits, and topical or dental treatments do not establish equivalent effects from drinking tea or taking capsules.

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Longevity
Longevity
Impact
High effect
Typical dose:200–800 mg

The catechins in green tea, particularly EGCG, activate pathways like AMPK that are associated with longevity and improved metabolic health. They help protect cells from oxidative damage, support cardiovascular function, and may enhance autophagy, the body's cellular cleanup process that removes damaged components.

Focuses on
Cell EnergyAntioxidantsMetabolic AgeingBrain Ageing
Most relevant for
Older adults seeking to support long-term systemic health and cognitive function through polyphenol-rich dietary habits.

Potential benefits

  • Reduced Mortality Risk.High daily consumption, particularly five or more cups, is associated with a lower risk of all-cause and cardiovascular-related mortality in large population studies.
  • Slower Biological Aging.Regular green tea intake is linked to slower shortening of leukocyte telomeres, a cellular marker used to track biological aging and cellular lifespan.
  • Cognitive Maintenance.Unconfirmed. Daily consumption may help reduce the risk of age-related cognitive decline, though findings vary across different populations and study designs.

Limitations

  • Limited Visible Rejuvenation.While green tea may improve skin elastic tissue at a microscopic level, clinical trials have failed to show visible improvements in the appearance of photoaged skin.
  • Inconsistent Brain Health Findings.Research on cognitive outcomes is mixed; some large-scale elderly cohorts found no protective effect against Alzheimer's disease or verbal memory decline.
  • Observational Nature of Data.Most evidence for longevity is based on traditional beverage consumption in specific cultures, which may not translate directly to the use of concentrated oral supplements.
Things to consider

Combination regimens of oral and topical green tea may cause increased skin irritation. Most longevity benefits are associated with drinking multiple cups of tea daily rather than single-dose supplementation.

Study evidence

9 studies

Green tea consumption is associated with some markers of healthier aging and lower mortality, but these observations do not prove that it slows aging. Evidence for visible skin rejuvenation is limited, and benefits from drinking tea cannot automatically be extended to concentrated extracts.

View goal
Metabolism Support
Metabolism Support
Impact
High effect
Typical dose:400–800 mg

The primary catechin in green tea, epigallocatechin gallate (EGCG), works with caffeine to inhibit an enzyme that breaks down norepinephrine. This results in prolonged stimulation of the nervous system, leading to a sustained increase in calorie burning and fat utilization.

Focuses on
Cell EnergyFat Burning
Most relevant for
Individuals seeking to enhance fat utilization during moderate exercise or support short-term calorie burning through catechin-rich supplementation.

Potential benefits

  • Enhanced Exercise Fat Oxidation.Clinical evidence and meta-analyses indicate that green tea extract can significantly increase the rate at which the body burns fat for fuel during and after moderate-intensity exercise.
  • Increased 24-Hour Energy Expenditure.Preparations containing a synergistic blend of catechins and caffeine have been shown to boost total daily calorie burning by approximately 4% in short-term respiratory chamber studies.
  • Postprandial Fat Metabolism.Acute intake may improve the body's ability to oxidize fat following a meal, although this effect may be dose-dependent and most effective at moderate catechin levels.

Limitations

  • Inconsistent Resting Metabolic Impact.While exercise-induced fat burning is well-documented, long-term studies often find no significant increase in resting energy expenditure or lasting changes in body composition.
  • Preparation and Caffeine Dependency.Metabolic benefits are frequently absent in studies using decaffeinated extracts, suggesting that the presence of caffeine is a critical factor for the observed thermogenic effect.
  • Dietary Inhibition.The thermogenic effect of green tea may be neutralized when consumed alongside milk proteins, which appear to inhibit its impact on diet-induced energy expenditure.
Things to consider

Metabolic effects are most pronounced during moderate-intensity physical activity. Avoid adding milk if using for metabolic support, as it may interfere with efficacy. Individual responses vary significantly based on genetic factors and habitual caffeine intake.

Study evidence

31 studies

Green tea extracts can increase fat use during exercise and may briefly raise energy expenditure, especially in preparations containing caffeine. Results vary, and these metabolic changes do not establish a sustained increase in metabolism, meaningful weight loss, or consistently better blood-sugar control.

View goal
Skin Health
Skin Health
Impact
High effect
Typical dose:250–1000 mg

Green tea is rich in catechins, particularly EGCG, which are powerful antioxidants. Clinical studies show that oral supplementation with green tea polyphenols can reduce inflammation and DNA damage from UV radiation, improve skin elasticity and moisture, and decrease skin roughness.

Focuses on
FirmnessSun ProtectionClear Skin
Most relevant for
Individuals seeking to complement their skin care routine with antioxidants to support resilience against UV stress and improve texture.

Potential benefits

  • Reduced UV Sensitivity.Clinical evidence suggests that both oral and topical green tea polyphenols may help the skin resist redness and inflammatory responses caused by ultraviolet light.
  • Texture and Elasticity Support.Regular use of green tea catechins has shown potential to improve skin roughness and maintain the health of elastic tissues in some clinical trials.
  • Targeted Acne and Oil Control.Topical green tea extracts are associated with a reduction in inflammatory acne lesions and may help manage excess sebum production.

Limitations

  • Inconsistent Oral Results.The effectiveness of oral supplements for sun protection is mixed, with several high-quality studies finding no significant reduction in UV-induced inflammation.
  • Formulation Dependency.Many documented benefits for acne, scarring, and specific skin conditions are limited to concentrated topical extracts rather than oral intake or drinking tea.
  • Unproven Anti-Aging Effects.Long-term research over two years has failed to show that oral green tea polyphenols significantly improve the visible or microscopic signs of skin aging compared to a placebo.
Things to consider

Topical preparations may cause localized skin irritation, itching, or a pricking sensation. High oral doses have been associated with mild gastrointestinal discomfort such as gas or nausea.

Study evidence

37 studies

Green tea compounds show benefits for some skin conditions, especially in topical formulations, but oral skin-health results are mixed. Research suggests possible improvements in skin properties and sun-induced redness, yet does not establish reliable protection from sun damage or lasting reversal of skin aging.

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Showing 6 of 10 goals

Studies

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Interactions

Positive Interactions

Theanine
Green tea naturally contains Theanine, which works synergistically with its caffeine to promote a state of relaxed alertness and improved focus, reducing potential jitters.
Vitamin C
Vitamin C can enhance the absorption and bioavailability of catechins (antioxidants) found in green tea, increasing its efficacy.
Turmeric
Both green tea's EGCG and the compounds in Turmeric (like Curcumin) are powerful antioxidants and anti-inflammatory agents, potentially offering amplified benefits when combined for cellular health.
Curcumin
Similar to Turmeric, Curcumin, its active compound, synergizes with green tea's catechins to provide enhanced antioxidant and anti-inflammatory support, beneficial for overall health.
Rutin
Rutin, a flavonoid, may help stabilize and enhance the bioavailability of catechins found in green tea, potentially increasing its antioxidant effects.
Resveratrol
Both Resveratrol and green tea catechins are potent antioxidants; their combined intake may offer enhanced cellular protection and anti-aging benefits.
Coenzyme Q-10
CoQ10 and green tea catechins both support mitochondrial function and provide antioxidant protection, making them synergistic for cellular energy and cardiovascular health.

Negative Interactions

Iron
Green tea catechins can bind to non-heme iron, potentially reducing its absorption. It is advisable to consume green tea separately from iron supplements or iron-rich meals.
Caffeine
Green tea contains caffeine. Combining it with additional Caffeine from other sources could lead to excessive caffeine intake, increasing the risk of side effects like jitters, insomnia, and increased heart rate.
St. John's Wort
There is theoretical concern that green tea could interfere with the metabolism of St. John's Wort, though less evidence than with medications.
Valerian
The stimulating effects of green tea (due to caffeine) could potentially counteract the sedative or calming effects of Valerian.
Sources

Up to five highest-ranked published examples per goal. Study counts and charts include all published studies for the connection.

  1. Safety and efficacy of cognitive training plus epigallocatechin-3-gallate in young adults with Down's syndrome (TESDAD): a double-blind, randomised, placebo-controlled, phase 2 trial.
    de la Torre R; de Sola S; Hernandez G; Farré M; Pujol J; Rodriguez J; Espadaler JM; Langohr K; Cuenca-Royo A; Principe A; Xicota L; Janel N; Catuara-Solarz S; Sanchez-Benavides G; Bléhaut H; Dueñas-Espín I; Del Hoyo L; Benejam B; Blanco-Hinojo L; Videla S; Fitó M; Delabar JM; Dierssen M; TESDAD study group · The Lancet. Neurology · 2017
    Randomized trial87 participantsCognitive Support
  2. Association between tea consumption and risk of cognitive disorders: A dose-response meta-analysis of observational studies.
    Liu X; Du X; Han G; Gao W · Oncotarget · 2018
    Meta-analysis48,435 participants17 studies pooledCognitive Support
  3. Investigating the Impact of Tea Consumption on Cognitive Function and Exploring Tea-Genetic Interactions in Older Adults Aged 65-105 Years: Findings from the 2002-2018 CLHLS Data.
    Yu L; Yang M; Ye KX; Li C; Zou M; Wang J; Yuan X; Zheng D; Sun C; Zhang Y; Feng Q; Maier AB; Sun L; Feng L; Wang Y; Chen H; Zeng Y · The journal of prevention of Alzheimer's disease · 2024
    Cohort study76,270 participantsCognitive Support
  4. Consumption of green tea, but not black tea or coffee, is associated with reduced risk of cognitive decline.
    Noguchi-Shinohara M; Yuki S; Dohmoto C; Ikeda Y; Samuraki M; Iwasa K; Yokogawa M; Asai K; Komai K; Nakamura H; Yamada M · PloS one · 2014
    Cohort study490 participantsCognitive Support
  5. Green Tea Consumption and the Risk of Incident Dementia in Elderly Japanese: The Ohsaki Cohort 2006 Study.
    Tomata Y; Sugiyama K; Kaiho Y; Honkura K; Watanabe T; Zhang S; Sugawara Y; Tsuji I · The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry · 2018
    Cohort study13,645 participantsCognitive Support
  6. Green tea catechins and blood pressure: a systematic review and meta-analysis of randomised controlled trials.
    Khalesi S; Sun J; Buys N; Jamshidi A; Nikbakht-Nasrabadi E; Khosravi-Boroujeni H · European journal of nutrition · 2015
    Meta-analysis13 studies pooledHeart Health
  7. Effect of Green Tea on Blood Pressure in Healthy Individuals: A Meta-Analysis.
    Yıldırım Ayaz E; Dincer B; Mesci B · Alternative therapies in health and medicine · 2023
    Meta-analysis680 participants9 studies pooledHeart HealthCardiovascular Support
  8. Green tea extract reduces blood pressure, inflammatory biomarkers, and oxidative stress and improves parameters associated with insulin resistance in obese, hypertensive patients.
    Bogdanski P; Suliburska J; Szulinska M; Stepien M; Pupek-Musialik D; Jablecka A · Nutrition research (New York, N.Y.) · 2012
    Randomized trial56 participantsHeart Health
  9. Green tea intake lowers fasting serum total and LDL cholesterol in adults: a meta-analysis of 14 randomized controlled trials.
    Zheng XX; Xu YL; Li SH; Liu XX; Hui R; Huang XH · The American journal of clinical nutrition · 2011
    Meta-analysis1,136 participants14 studies pooledHeart Health
  10. Effects of green tea on lipid profile in overweight and obese women.
    Li A; Wang Q; Li P; Zhao N; Liang Z · International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition · 2024
    Meta-analysis1,818 participants15 studies pooledHeart HealthCardiovascular Support
  11. The effects of green tea on acne vulgaris: A systematic review and meta-analysis of randomized clinical trials.
    Kim S; Park TH; Kim WI; Park S; Kim JH; Cho MK · Phytotherapy research : PTR · 2021
    Meta-analysis247 participants5 studies pooledInflammation
  12. Green Tea Catechin Association with Ultraviolet Radiation-Induced Erythema: A Systematic Review and Meta-Analysis.
    Kapoor MP; Sugita M; Fukuzawa Y; Timm D; Ozeki M; Okubo T · Molecules (Basel, Switzerland) · 2021
    Meta-analysis100 participants6 studies pooledSkin HealthInflammation
  13. Efficacy of (-)-epigallocatechin gallate delivered by a new-type scaler tip during scaling and root planing on chronic periodontitis: a split-mouth, randomized clinical trial.
    Wang Y; Zeng J; Yuan Q; Luan Q · BMC oral health · 2021
    Randomized trial20 participantsInflammation
  14. Camellia Sinensis Mouthwashes in Oral Care: a Systematic Review.
    Tafazoli A; Tafazoli Moghadam E · Journal of dentistry (Shiraz, Iran) · 2020
    Systematic review69 studies pooledInflammation
  15. Skin photoprotection by green tea: antioxidant and immunomodulatory effects.
    Katiyar SK · Current drug targets. Immune, endocrine and metabolic disorders · 2004
    Narrative reviewInflammation
  16. Green tea and coffee intake and risk of cognitive decline in older adults: the National Institute for Longevity Sciences, Longitudinal Study of Aging.
    Shirai Y; Kuriki K; Otsuka R; Kato Y; Nishita Y; Tange C; Tomida M; Imai T; Ando F; Shimokata H · Public health nutrition · 2021
    Cohort study1,305 participantsLongevity
  17. Associations of green tea, coffee, and soft drink consumption with longitudinal changes in leukocyte telomere length.
    Sohn I; Shin C; Baik I · Scientific reports · 2023
    Cohort study1,952 participantsLongevity
  18. Can teatime increase one's lifetime?
    Nakachi K; Eguchi H; Imai K · Ageing research reviews · 2003
    Cohort studyLongevity
  19. Influences of tea consumption on self-rated health and life satisfaction among older adults: Evidence from the CLHLS.
    Zou M; Sun C; Yang M; Li C; Wang S; Zheng D; Wang J; Yu L; Sun L; Wang Y; Chen H; Zeng Y · PsyCh journal · 2025
    Cohort study78,345 participantsLongevity
  20. Double-blinded, placebo-controlled trial of green tea extracts in the clinical and histologic appearance of photoaging skin.
    Chiu AE; Chan JL; Kern DG; Kohler S; Rehmus WE; Kimball AB · Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.] · 2005
    Randomized trial40 participantsLongevity
  21. Effect of green tea on glucose control and insulin sensitivity: a meta-analysis of 17 randomized controlled trials.
    Liu K; Zhou R; Wang B; Chen K; Shi LY; Zhu JD; Mi MT · The American journal of clinical nutrition · 2013
    Meta-analysis1,133 participants17 studies pooledMetabolism Support
  22. Green tea extract ingestion, fat oxidation, and glucose tolerance in healthy humans.
    Venables MC; Hulston CJ; Cox HR; Jeukendrup AE · The American journal of clinical nutrition · 2008
    Randomized trial23 participantsMetabolism Support
  23. Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans.
    Dulloo AG; Duret C; Rohrer D; Girardier L; Mensi N; Fathi M; Chantre P; Vandermander J · The American journal of clinical nutrition · 1999
    Randomized trial10 participantsMetabolism Support
  24. A 60-Day Green Tea Extract Supplementation Counteracts the Dysfunction of Adipose Tissue in Overweight Post-Menopausal and Class I Obese Women.
    Rondanelli M; Gasparri C; Perna S; Petrangolini G; Allegrini P; Fazia T; Bernardinelli L; Cavioni A; Mansueto F; Oberto L; Patelli Z; Tartara A; Riva A · Nutrients · 2022
    Randomized trial28 participantsMetabolism Support
  25. Epigallocatechin gallate alleviates non-alcoholic fatty liver disease through the inhibition of the expression and activity of Dipeptide kinase 4.
    Yang M; Yan R; Sha R; Wang X; Zhou S; Li B; Zheng Q; Cao Y · Clinical nutrition (Edinburgh, Scotland) · 2024
    Randomized trialMetabolism Support
  26. Topical Polyphenon E in the treatment of external genital and perianal warts: a randomized controlled trial.
    Stockfleth E; Beti H; Orasan R; Grigorian F; Mescheder A; Tawfik H; Thielert C · The British journal of dermatology · 2008
    Randomized trial503 participantsSkin Health
  27. Efficacy, safety and tolerability of green tea catechins in the treatment of external anogenital warts: a systematic review and meta-analysis.
    Tzellos TG; Sardeli C; Lallas A; Papazisis G; Chourdakis M; Kouvelas D · Journal of the European Academy of Dermatology and Venereology : JEADV · 2011
    Meta-analysis1,247 participants3 studies pooledSkin Health
  28. Green tea polyphenols provide photoprotection, increase microcirculation, and modulate skin properties of women.
    Heinrich U; Moore CE; De Spirt S; Tronnier H; Stahl W · The Journal of nutrition · 2011
    Randomized trial60 participantsSkin Health
  29. Efficacy of Epigallocatechin-3-Gallate in Preventing Dermatitis in Patients With Breast Cancer Receiving Postoperative Radiotherapy: A Double-Blind, Placebo-Controlled, Phase 2 Randomized Clinical Trial.
    Zhao H; Zhu W; Zhao X; Li X; Zhou Z; Zheng M; Meng X; Kong L; Zhang S; He D; Xing L; Yu J · JAMA dermatology · 2022
    Randomized trial180 participantsSkin Health
  30. A green tea extract high in catechins reduces body fat and cardiovascular risks in humans.
    Nagao T; Hase T; Tokimitsu I · Obesity (Silver Spring, Md.) · 2007
    Randomized trial240 participantsCardiovascular SupportWeight Loss
  31. Green tea beverages enriched with catechins with a galloyl moiety reduce body fat in moderately obese adults: a randomized double-blind placebo-controlled trial.
    Kobayashi M; Kawano T; Ukawa Y; Sagesaka YM; Fukuhara I · Food & function · 2016
    Randomized trial126 participantsWeight Loss
  32. Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adults.
    Maki KC; Reeves MS; Farmer M; Yasunaga K; Matsuo N; Katsuragi Y; Komikado M; Tokimitsu I; Wilder D; Jones F; Blumberg JB; Cartwright Y · The Journal of nutrition · 2009
    Randomized trial132 participantsWeight Loss
  33. Effect of Decaffeinated Green Tea Polyphenols on Body Fat and Precocious Puberty in Obese Girls: A Randomized Controlled Trial.
    Xie L; Tang Q; Yao D; Gu Q; Zheng H; Wang X; Yu Z; Shen X · Frontiers in endocrinology · 2022
    Randomized trial62 participantsWeight Loss
  34. Effectiveness of green tea on weight reduction in obese Thais: A randomized, controlled trial.
    Auvichayapat P; Prapochanung M; Tunkamnerdthai O; Sripanidkulchai BO; Auvichayapat N; Thinkhamrop B; Kunhasura S; Wongpratoom S; Sinawat S; Hongprapas P · Physiology & behavior · 2008
    Randomized trial60 participantsWeight Loss
  35. Preventive effects of tea and tea catechins against influenza and acute upper respiratory tract infections: a systematic review and meta-analysis
    Mai Umeda, Takeichiro Tominaga, Kazuya Kozuma, Hidefumi Kitazawa, Daisuke Furushima, Masanobu Hibi, Hiroshi Yamada · European Journal of Nutrition · 2021
    Meta-analysis3,748 participants10 studies pooledImmunity
  36. Prevention of Acute Upper Respiratory Infections by Consumption of Catechins in Healthcare Workers: A Randomized, Placebo-Controlled Trial
    Daisuke Furushima, Takuma Nishimura, Norikata Takuma, Ryo Iketani, Tomohito Mizuno, Yuji Matsui, Tohru Yamaguchi, Yu Nakashima, Shinji Yamamoto, Masanobu Hibi, Hiroshi Yamada · Nutrients · 2019
    Randomized trial255 participantsImmunity
  37. The effects of green tea supplementation on cardiovascular risk factors: A systematic review and meta-analysis.
    Zamani M; Kelishadi MR; Ashtary-Larky D; Amirani N; Goudarzi K; Torki IA; Bagheri R; Ghanavati M; Asbaghi O · Frontiers in nutrition · 2023
    Meta-analysis55 studies pooledCardiovascular Support
  38. Green tea consumption and risk of cardiovascular and ischemic related diseases: A meta-analysis.
    Pang J; Zhang Z; Zheng TZ; Bassig BA; Mao C; Liu X; Zhu Y; Shi K; Ge J; Yang YJ; Dejia-Huang; Bai M; Peng Y · International journal of cardiology · 2016
    Meta-analysis259,267 participants9 studies pooledCardiovascular Support
  39. Therapeutic benefits of green tea extract on various parameters in non-alcoholic fatty liver disease patients.
    Hussain M; Habib-Ur-Rehman; Akhtar L · Pakistan journal of medical sciences · 2024
    Randomized trial80 participantsLiver & Detox
  40. The Effect of Green Tea Extract Supplementation on Liver Enzymes in Patients with Nonalcoholic Fatty Liver Disease.
    Pezeshki A; Safi S; Feizi A; Askari G; Karami F · International journal of preventive medicine · 2016
    Randomized trial80 participantsLiver & Detox
  41. Green tea with high-density catechins improves liver function and fat infiltration in non-alcoholic fatty liver disease (NAFLD) patients: a double-blind placebo-controlled study.
    Sakata R; Nakamura T; Torimura T; Ueno T; Sata M · International journal of molecular medicine · 2014
    Randomized trial17 participantsLiver & Detox
  42. Green tea consumption is associated with decreased DNA damage among GSTM1-positive smokers regardless of their hOGG1 genotype.
    Hakim IA; Chow HH; Harris RB · The Journal of nutrition · 2008
    Randomized trialLiver & Detox
  43. Modulation of human glutathione s-transferases by polyphenon e intervention.
    Chow HH; Hakim IA; Vining DR; Crowell JA; Tome ME; Ranger-Moore J; Cordova CA; Mikhael DM; Briehl MM; Alberts DS · Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology · 2007
    Single-arm trial42 participantsLiver & Detox