Supplement

Green Tea Extract

Green tea extract is a concentrated source of catechins, plant antioxidants that slow the breakdown of norepinephrine, a body signal that helps drive fat burning. People mostly look at it for weight management, where the evidence is moderate overall, though two trials found no clear difference in body fat, and blood pressure improved in small studies of people with obesity. Most studies were small, so the evidence for any single result is limited.

Sources: PMID 19680234; PMID 25479028

Updated 30 September 2026
How we grade
44 studies cited

Best evidence: Grade B
Conditions studied: 22
Outcomes: 110
Graded outcomes: 0388

Evidence by condition

Strong
Moderate
Limited
Very limited

22 conditions

General Cardiovascular Health

General Cardiovascular Health: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Blood Pressure Small Improvement	Improves (the measure goes down)	Small effect	6 studies	2,038 people
Studies that measured blood pressure Effects of dietary supplementation with the green tea polyphenol epigallocatechin-3-gallate on insulin resistance and associated metabolic risk factors: randomized controlled trialBr J Nutr · PMID 18710606 Effect of green tea supplementation on blood pressure in adults: a GRADE-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Blood Press · PMID 40497293 Effect of green tea supplementation on blood pressure among overweight and obese adults: a systematic review and meta-analysis.J Hypertens · PMID 25479028 Effect of green tea supplementation on blood pressure: A systematic review and meta-analysis of randomized controlled trials.Medicine · PMID 32028419 Green tea catechins and blood pressure: a systematic review and meta-analysis of randomised controlled trials.Eur J Nutr · PMID 24861099 Effect of green tea consumption on blood pressure: a meta-analysis of 13 randomized controlled trialsSci Rep · PMID 25176280
	C-Reactive Protein (CRP)	Improves (the measure goes down)		2 studies	2,872 people
Studies that measured c-reactive protein (crp) The effect of green tea on inflammatory mediators: A systematic review and meta-analysis of randomized clinical trials.Phytother Res · PMID 31309655 Effects of green tea supplementation on antioxidant status and inflammatory markers in adults: a grade-assessed systematic review and dose-response meta-analysis of randomised controlled trials.J Nutr Sci · PMID 40160899
	Cognition	Improves (the measure goes up)		2 studies	27 people
Studies that measured cognition Epigallocatechin gallate, cerebral blood flow parameters, cognitive performance and mood in healthy humans: a double-blind, placebo-controlled, crossover investigationHum Psychopharmacol · PMID 22389082 A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled studyJ Med Food · PMID 21303262
	Heart Rate	Improves (the measure goes down)		1 study	27 people
Studies that measured heart rate Epigallocatechin-3-gallate increases maximal oxygen uptake in adult humansMed Sci Sports Exerc · PMID 19952844
	Total Antioxidant Capacity (TAC)	Improves (the measure goes up)		1 study	2,745 people
Studies that measured total antioxidant capacity (tac) Effect of Green Tea Supplementation on Antioxidant Status in Adults: A Systematic Review and Meta-Analysis of Randomized Clinical Trials.Antioxidants · PMID 34829602
	Cerebral Blood Flow	Improves (the measure goes up)			27 people
	Interleukin 1-beta	Improves (the measure goes down)			1,985 people
	Interleukin 6	Improves (the measure goes down)			2,872 people
	Oxidative Stress Biomarkers	Improves (the measure goes down)			2,745 people
	TNF-Alpha	Improves (the measure goes down)			2,872 people

General Athletic Performance

General Athletic Performance: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Studies	People
	Fat Oxidation Mixed effect		5 studies	31 people
Studies that measured fat oxidation Epigallocatechin-3-gallate and postprandial fat oxidation in overweight/obese male volunteers: a pilot studyEur J Clin Nutr · PMID 20372175 The effects of epigallocatechin-3-gallate on thermogenesis and fat oxidation in obese men: a pilot studyJ Am Coll Nutr · PMID 17906192 Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humansScand J Med Sci Sports · PMID 20459475 The effects of EGCG on fat oxidation and endurance performance in male cyclistsInt J Sport Nutr Exerc Metab · PMID 20175431 Effect of moderate intakes of different tea catechins and caffeine on acute measures of energy metabolism under sedentary conditionsBr J Nutr · PMID 19445822
	Heart Rate	Improves (the measure goes down)	1 study	19 people
Studies that measured heart rate Epigallocatechin-3-gallate increases maximal oxygen uptake in adult humansMed Sci Sports Exerc · PMID 19952844
	Muscle Soreness	Improves (the measure goes down)	1 study	30 people
Studies that measured muscle soreness Intramuscular adaptations to eccentric exercise and antioxidant supplementationAmino Acids · PMID 19967420
	Oxygen Uptake	Improves (the measure goes up)		38 people

Aerobic Exercise Performance

Fat Oxidation
Heart Rate: improves
Oxygen Uptake: improves

Aerobic Exercise Performance: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Studies	People
	Fat Oxidation Mixed effect		5 studies	31 people
Studies that measured fat oxidation Epigallocatechin-3-gallate and postprandial fat oxidation in overweight/obese male volunteers: a pilot studyEur J Clin Nutr · PMID 20372175 The effects of epigallocatechin-3-gallate on thermogenesis and fat oxidation in obese men: a pilot studyJ Am Coll Nutr · PMID 17906192 Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humansScand J Med Sci Sports · PMID 20459475 The effects of EGCG on fat oxidation and endurance performance in male cyclistsInt J Sport Nutr Exerc Metab · PMID 20175431 Effect of moderate intakes of different tea catechins and caffeine on acute measures of energy metabolism under sedentary conditionsBr J Nutr · PMID 19445822
	Heart Rate	Improves (the measure goes down)	1 study	19 people
Studies that measured heart rate Epigallocatechin-3-gallate increases maximal oxygen uptake in adult humansMed Sci Sports Exerc · PMID 19952844
	Oxygen Uptake	Improves (the measure goes up)		38 people

Obesity

Blood Pressure: improves
Adiponectin: improves
Weight: improves

Obesity: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Blood Pressure Small Improvement	Improves (the measure goes down)	Small effect	6 studies	88 people
Studies that measured blood pressure Effects of dietary supplementation with the green tea polyphenol epigallocatechin-3-gallate on insulin resistance and associated metabolic risk factors: randomized controlled trialBr J Nutr · PMID 18710606 Effect of green tea supplementation on blood pressure in adults: a GRADE-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Blood Press · PMID 40497293 Effect of green tea supplementation on blood pressure among overweight and obese adults: a systematic review and meta-analysis.J Hypertens · PMID 25479028 Effect of green tea supplementation on blood pressure: A systematic review and meta-analysis of randomized controlled trials.Medicine · PMID 32028419 Green tea catechins and blood pressure: a systematic review and meta-analysis of randomised controlled trials.Eur J Nutr · PMID 24861099 Effect of green tea consumption on blood pressure: a meta-analysis of 13 randomized controlled trialsSci Rep · PMID 25176280
	Adiponectin Small Increase	Improves (the measure goes up)	Small effect		78 people
	Weight	Improves (the measure goes down)		6 studies	1,562 people
Studies that measured weight Green tea for weight loss and weight maintenance in overweight or obese adultsCochrane Database Syst Rev · PMID 23235664 Effect of green tea extract on obese women: a randomized, double-blind, placebo-controlled clinical trialClin Nutr · PMID 18468736 Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndromeJ Am Coll Nutr · PMID 20595643 The effects of green tea extract supplementation on body composition, obesity-related hormones and oxidative stress markers: a grade-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Br J Nutr · PMID 38031409 Effect of Green Tea on Anthropometric Indices and Body Composition in Patients with Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis.Complement Med Res · PMID 33207344 Green tea promotes weight loss in women with polycystic ovary syndrome: Systematic review and meta-analysis.Nutr Res · PMID 35504067
	Fat Oxidation	Improves (the measure goes up)		5 studies	16 people
Studies that measured fat oxidation Epigallocatechin-3-gallate and postprandial fat oxidation in overweight/obese male volunteers: a pilot studyEur J Clin Nutr · PMID 20372175 The effects of epigallocatechin-3-gallate on thermogenesis and fat oxidation in obese men: a pilot studyJ Am Coll Nutr · PMID 17906192 Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humansScand J Med Sci Sports · PMID 20459475 The effects of EGCG on fat oxidation and endurance performance in male cyclistsInt J Sport Nutr Exerc Metab · PMID 20175431 Effect of moderate intakes of different tea catechins and caffeine on acute measures of energy metabolism under sedentary conditionsBr J Nutr · PMID 19445822
	Body Fat	Improves (the measure goes down)		2 studies	3,802 people
Studies that measured body fat Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adultsJ Nutr · PMID 19074207 Effects of catechin enriched green tea on body compositionObesity · PMID 19680234
	High-density lipoprotein (HDL)	Improves (the measure goes up)		1 study	78 people
	Leptin	Improves (the measure goes up)		1 study	927 people
	Low-density lipoprotein (LDL)	Improves (the measure goes down)		1 study	119 people
	Metabolic Rate	Improves (the measure goes up)		1 study	10 people
	Body Mass Index (BMI)	Improves (the measure goes down)			3,802 people
	Ghrelin	Improves (the measure goes up)			927 people
	Glycemic Control	Improves (the measure goes up)			88 people
	Oxidative Stress Biomarkers	Improves (the measure goes down)			35 people
	Thermic effect of food (TEF)	Improves (the measure goes up)			10 people
	Waist circumference	Improves (the measure goes down)			3,802 people

Muscle Recovery

Exercise-Induced Oxidation: improves
Muscle Soreness: improves

Muscle Recovery: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Exercise-Induced Oxidation Small Decrease	Improves (the measure goes down)	Small effect	1 study	35 people
Studies that measured exercise-induced oxidation Green tea extract supplementation gives protection against exercise-induced oxidative damage in healthy menNutr Res · PMID 22118751
	Muscle Soreness	Improves (the measure goes down)		1 study	30 people
Studies that measured muscle soreness Intramuscular adaptations to eccentric exercise and antioxidant supplementationAmino Acids · PMID 19967420

Skin Health

Photoprotection: improves
Skin Quality: improves

Skin Health: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Photoprotection Small Improvement	Improves (the measure goes up)	Small effect	1 study	60 people
Studies that measured photoprotection Green tea polyphenols provide photoprotection, increase microcirculation, and modulate skin properties of womenJ Nutr · PMID 21525260
	Skin Quality	Improves (the measure goes up)			60 people

Weight Loss & Maintenance

Adiponectin: improves
Weight: improves
Fat Oxidation: improves

Weight Loss & Maintenance: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Adiponectin Small Increase	Improves (the measure goes up)	Small effect		78 people
	Weight	Improves (the measure goes down)		6 studies	1,562 people
Studies that measured weight Green tea for weight loss and weight maintenance in overweight or obese adultsCochrane Database Syst Rev · PMID 23235664 Effect of green tea extract on obese women: a randomized, double-blind, placebo-controlled clinical trialClin Nutr · PMID 18468736 Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndromeJ Am Coll Nutr · PMID 20595643 The effects of green tea extract supplementation on body composition, obesity-related hormones and oxidative stress markers: a grade-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Br J Nutr · PMID 38031409 Effect of Green Tea on Anthropometric Indices and Body Composition in Patients with Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis.Complement Med Res · PMID 33207344 Green tea promotes weight loss in women with polycystic ovary syndrome: Systematic review and meta-analysis.Nutr Res · PMID 35504067
	Fat Oxidation	Improves (the measure goes up)		5 studies	6 people
Studies that measured fat oxidation Epigallocatechin-3-gallate and postprandial fat oxidation in overweight/obese male volunteers: a pilot studyEur J Clin Nutr · PMID 20372175 The effects of epigallocatechin-3-gallate on thermogenesis and fat oxidation in obese men: a pilot studyJ Am Coll Nutr · PMID 17906192 Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humansScand J Med Sci Sports · PMID 20459475 The effects of EGCG on fat oxidation and endurance performance in male cyclistsInt J Sport Nutr Exerc Metab · PMID 20175431 Effect of moderate intakes of different tea catechins and caffeine on acute measures of energy metabolism under sedentary conditionsBr J Nutr · PMID 19445822
	Body Fat	Improves (the measure goes down)		2 studies	79 people
Studies that measured body fat Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adultsJ Nutr · PMID 19074207 Effects of catechin enriched green tea on body compositionObesity · PMID 19680234
	High-density lipoprotein (HDL)	Improves (the measure goes up)		1 study	132 people
Studies that measured high-density lipoprotein (hdl) Green tea improves metabolic biomarkers, not weight or body composition: a pilot study in overweight breast cancer survivorsJ Hum Nutr Diet · PMID 20807303
	Leptin	Improves (the measure goes up)		1 study	927 people
	Low-density lipoprotein (LDL)	Improves (the measure goes down)		1 study	78 people
	Body Mass Index (BMI)	Improves (the measure goes down)			109 people
	Food Intake	Changes; see studies			79 people
	Ghrelin	Improves (the measure goes up)			927 people
	Waist circumference	Improves (the measure goes down)			75 people
	Waist-Hip Ratio	Improves (the measure goes up)			109 people

Cognitive Improvement

Cerebral Blood Flow: worsens
Cognition: improves

Cognitive Improvement: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Cerebral Blood Flow Small Decrease	Worsens (the measure goes down)	Small effect		27 people
	Cognition	Improves (the measure goes up)		2 studies	27 people
Studies that measured cognition Epigallocatechin gallate, cerebral blood flow parameters, cognitive performance and mood in healthy humans: a double-blind, placebo-controlled, crossover investigationHum Psychopharmacol · PMID 22389082 A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled studyJ Med Food · PMID 21303262

Metabolic Syndrome

Oxidative Stress Biomarkers: improves
Weight: improves

Metabolic Syndrome: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Oxidative Stress Biomarkers Small Decrease	Improves (the measure goes down)	Small effect		35 people
	Weight	Improves (the measure goes down)		6 studies	35 people
Studies that measured weight Green tea for weight loss and weight maintenance in overweight or obese adultsCochrane Database Syst Rev · PMID 23235664 Effect of green tea extract on obese women: a randomized, double-blind, placebo-controlled clinical trialClin Nutr · PMID 18468736 Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndromeJ Am Coll Nutr · PMID 20595643 The effects of green tea extract supplementation on body composition, obesity-related hormones and oxidative stress markers: a grade-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Br J Nutr · PMID 38031409 Effect of Green Tea on Anthropometric Indices and Body Composition in Patients with Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis.Complement Med Res · PMID 33207344 Green tea promotes weight loss in women with polycystic ovary syndrome: Systematic review and meta-analysis.Nutr Res · PMID 35504067

Mood Improvement

Cerebral Blood Flow: worsens
Cognition: improves
Heart Rate: improves

Mood Improvement: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Cerebral Blood Flow Small Decrease	Worsens (the measure goes down)	Small effect		27 people
	Cognition	Improves (the measure goes up)		2 studies	27 people
Studies that measured cognition Epigallocatechin gallate, cerebral blood flow parameters, cognitive performance and mood in healthy humans: a double-blind, placebo-controlled, crossover investigationHum Psychopharmacol · PMID 22389082 A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled studyJ Med Food · PMID 21303262
	Heart Rate	Improves (the measure goes down)		1 study	27 people
Studies that measured heart rate Epigallocatechin-3-gallate increases maximal oxygen uptake in adult humansMed Sci Sports Exerc · PMID 19952844

Overweight

Body Fat
Fat Oxidation: improves
Low-density lipoprotein (LDL): improves

Overweight: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Body Fat No effect		NoneNo effect	2 studies	148 people
Studies that measured body fat Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adultsJ Nutr · PMID 19074207 Effects of catechin enriched green tea on body compositionObesity · PMID 19680234
	Fat Oxidation	Improves (the measure goes up)		5 studies	10 people
Studies that measured fat oxidation Epigallocatechin-3-gallate and postprandial fat oxidation in overweight/obese male volunteers: a pilot studyEur J Clin Nutr · PMID 20372175 The effects of epigallocatechin-3-gallate on thermogenesis and fat oxidation in obese men: a pilot studyJ Am Coll Nutr · PMID 17906192 Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humansScand J Med Sci Sports · PMID 20459475 The effects of EGCG on fat oxidation and endurance performance in male cyclistsInt J Sport Nutr Exerc Metab · PMID 20175431 Effect of moderate intakes of different tea catechins and caffeine on acute measures of energy metabolism under sedentary conditionsBr J Nutr · PMID 19445822
	Low-density lipoprotein (LDL)	Improves (the measure goes down)		1 study	41 people
Studies that measured low-density lipoprotein (ldl) Catechin safely improved higher levels of fatness, blood pressure, and cholesterol in childrenObesity · PMID 18356827
	Metabolic Rate	Improves (the measure goes up)		1 study	10 people
Studies that measured metabolic rate Influence of short-term consumption of the caffeine-free, epigallocatechin-3-gallate supplement, Teavigo, on resting metabolism and the thermic effect of feedingObesity · PMID 20725062
	Thermic effect of food (TEF)	Improves (the measure goes up)			10 people

Polycystic Ovary Syndrome (PCOS)

Body Fat
Weight: improves
Body Mass Index (BMI): improves

Polycystic Ovary Syndrome (PCOS): outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People
	Body Fat No effect		NoneNo effect	2 studies	79 people
Studies that measured body fat Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adultsJ Nutr · PMID 19074207 Effects of catechin enriched green tea on body compositionObesity · PMID 19680234
	Weight	Improves (the measure goes down)		6 studies	169 people
Studies that measured weight Green tea for weight loss and weight maintenance in overweight or obese adultsCochrane Database Syst Rev · PMID 23235664 Effect of green tea extract on obese women: a randomized, double-blind, placebo-controlled clinical trialClin Nutr · PMID 18468736 Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndromeJ Am Coll Nutr · PMID 20595643 The effects of green tea extract supplementation on body composition, obesity-related hormones and oxidative stress markers: a grade-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Br J Nutr · PMID 38031409 Effect of Green Tea on Anthropometric Indices and Body Composition in Patients with Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis.Complement Med Res · PMID 33207344 Green tea promotes weight loss in women with polycystic ovary syndrome: Systematic review and meta-analysis.Nutr Res · PMID 35504067
	Body Mass Index (BMI)	Improves (the measure goes down)			109 people
	Food Intake	Changes; see studies			79 people
	Waist circumference	Improves (the measure goes down)			75 people
	Waist-Hip Ratio	Improves (the measure goes up)			109 people

Dyslipidemia

High-density lipoprotein (HDL)
Total cholesterol: improves
Low-density lipoprotein (LDL): improves

Dyslipidemia: outcomes studied for Green Tea Extract
Outcome	Effect	Size	Studies	People
High-density lipoprotein (HDL) No effect		NoneNo effect	1 study	3,073 people
Total cholesterol	Improves (the measure goes down)		2 studies	3,024 people
Low-density lipoprotein (LDL)	Improves (the measure goes down)		1 study	3,005 people
Triglycerides	Improves (the measure goes down)			33 people

Metabolic Health

Blood glucose
Insulin: changes; see studies
Fat Oxidation: improves

Metabolic Health: outcomes studied for Green Tea Extract
Outcome	Effect	Size	Studies	People
Blood glucose No effect		NoneNo effect		1,819 people
Insulin	Changes; see studies		7 studies	1,819 people
Fat Oxidation	Improves (the measure goes up)		5 studies	50 people
C-Reactive Protein (CRP)	Improves (the measure goes down)		2 studies	313 people
Iron Absorption	Improves (the measure goes up)		1 study	30 people
Low-density lipoprotein (LDL)	Improves (the measure goes down)		1 study	103 people
Metabolic Rate	Improves (the measure goes up)		1 study	31 people
Estrogen	Changes; see studies			103 people
Glycemic Control	Improves (the measure goes up)			23 people
HbA1c	Improves (the measure goes down)			1,819 people
Insulin Resistance	Improves (the measure goes down)			1,819 people
Interleukin 6	Improves (the measure goes down)			42 people
Testosterone	Improves (the measure goes up)			103 people

Type 2 Diabetes

Blood glucose
Insulin: changes; see studies
Weight: improves

Type 2 Diabetes: outcomes studied for Green Tea Extract
Outcome	Effect	Size	Studies	People
Blood glucose No effect		NoneNo effect		1,251 people
Insulin	Changes; see studies		7 studies	870 people
Weight	Improves (the measure goes down)		6 studies	546 people
Body Fat	Improves (the measure goes down)		2 studies	251 people
Body Mass Index (BMI)	Improves (the measure goes down)			665 people
Glycemic Control	Improves (the measure goes up)			189 people
HbA1c	Improves (the measure goes down)			460 people
Insulin Resistance	Improves (the measure goes down)			336 people
Waist circumference	Improves (the measure goes down)			452 people

High Blood Pressure

Blood glucose
Blood Pressure: improves
Total cholesterol: improves

High Blood Pressure: outcomes studied for Green Tea Extract
Outcome	Effect	Size	Studies	People
Blood glucose No effect		NoneNo effect		1,040 people
Blood Pressure	Improves (the measure goes down)		6 studies	971 people
Total cholesterol	Improves (the measure goes down)		2 studies	1,040 people
High-density lipoprotein (HDL)	Improves (the measure goes up)		1 study	1,040 people
Low-density lipoprotein (LDL)	Improves (the measure goes down)		1 study	1,040 people
Body Mass Index (BMI)	Improves (the measure goes down)			1,040 people
Triglycerides	Improves (the measure goes down)			1,040 people

Prediabetes

Blood glucose
Insulin: changes; see studies
Glycemic Control: improves

Prediabetes: outcomes studied for Green Tea Extract
Outcome	Effect	Size	Studies	People
Blood glucose No effect		NoneNo effect		1,251 people
Insulin	Changes; see studies		7 studies	870 people
Glycemic Control	Improves (the measure goes up)			189 people
HbA1c	Improves (the measure goes down)			460 people
Insulin Resistance	Improves (the measure goes down)			336 people

Appetite Regulation

Ghrelin
Leptin: improves

Appetite Regulation: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People	Studies list
	Ghrelin No effect		NoneNo effect		927 people
	Leptin	Improves (the measure goes up)		1 study	927 people

Cycling Performance

Fat Oxidation: improves

Cycling Performance: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People	Studies list
	Fat Oxidation	Improves (the measure goes up)		5 studies	8 people

Body Composition

Body Fat: improves

Body Composition: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People	Studies list
	Body Fat	Improves (the measure goes down)		2 studies	182 people

Mild Cognitive Impairment (MCI)

Cognition: improves

Mild Cognitive Impairment (MCI): outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People	Studies list
	Cognition	Improves (the measure goes up)		2 studies	45 people

Digestive Health

Carbohydrate Absorption: improves

Digestive Health: outcomes studied for Green Tea Extract
Grade	Outcome	Effect	Size	Studies	People	Studies list
	Carbohydrate Absorption	Improves (the measure goes up)		1 study	28 people

Key findings

Blood PressureImproves (the measure goes down)
Fat OxidationGeneral Athletic Performance
Exercise-Induced OxidationMuscle RecoveryImproves (the measure goes down)

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Studies cited

44 studies from PubMed

Effect of Green Tea Supplementation on Inflammatory Markers among Patients with Metabolic Syndrome and Related Disorders: A Systematic Review and Meta-Analysis.Prev Nutr Food Sci · PMID 38974590
Epigallocatechin-3-gallate and postprandial fat oxidation in overweight/obese male volunteers: a pilot studyEur J Clin Nutr · PMID 20372175
The effects of epigallocatechin-3-gallate on thermogenesis and fat oxidation in obese men: a pilot studyJ Am Coll Nutr · PMID 17906192
Green tea for weight loss and weight maintenance in overweight or obese adultsCochrane Database Syst Rev · PMID 23235664
Effect of green tea extract on obese women: a randomized, double-blind, placebo-controlled clinical trialClin Nutr · PMID 18468736
Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndromeJ Am Coll Nutr · PMID 20595643
The effects of green tea extract supplementation on body composition, obesity-related hormones and oxidative stress markers: a grade-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Br J Nutr · PMID 38031409
Effects of dietary supplementation with the green tea polyphenol epigallocatechin-3-gallate on insulin resistance and associated metabolic risk factors: randomized controlled trialBr J Nutr · PMID 18710606
Catechin safely improved higher levels of fatness, blood pressure, and cholesterol in childrenObesity · PMID 18356827
Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adultsJ Nutr · PMID 19074207
Effect of green tea on plasma leptin and ghrelin levels: A systematic review and meta-analysis of randomized controlled clinical trials.Nutrition · PMID 29129232
Epigallocatechin-3-gallate increases maximal oxygen uptake in adult humansMed Sci Sports Exerc · PMID 19952844
Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humansScand J Med Sci Sports · PMID 20459475
Intramuscular adaptations to eccentric exercise and antioxidant supplementationAmino Acids · PMID 19967420
Effect of green tea on glucose control and insulin sensitivity: a meta-analysis of 17 randomized controlled trials.Am J Clin Nutr · PMID 23803878
Does supplementation with green tea extract improve insulin resistance in obese type 2 diabetics? A randomized, double-blind, and placebo-controlled clinical trialAltern Med Rev · PMID 21649457
Effects of green tea consumption on glycemic control: a systematic review and meta-analysis of randomized controlled trials.Nutr Metab · PMID 32670385
Effect of green tea on glycemic control in patients with type 2 diabetes mellitus: A systematic review and meta-analysis.Diabetes Metab Syndr · PMID 33285391
Effect of Green Tea on Anthropometric Indices and Body Composition in Patients with Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis.Complement Med Res · PMID 33207344
Green tea promotes weight loss in women with polycystic ovary syndrome: Systematic review and meta-analysis.Nutr Res · PMID 35504067
Green tea improves metabolic biomarkers, not weight or body composition: a pilot study in overweight breast cancer survivorsJ Hum Nutr Diet · PMID 20807303
Effects of catechin enriched green tea on body compositionObesity · PMID 19680234
Epigallocatechin gallate, cerebral blood flow parameters, cognitive performance and mood in healthy humans: a double-blind, placebo-controlled, crossover investigationHum Psychopharmacol · PMID 22389082
The effect of green tea on inflammatory mediators: A systematic review and meta-analysis of randomized clinical trials.Phytother Res · PMID 31309655
Effects of green tea supplementation on antioxidant status and inflammatory markers in adults: a grade-assessed systematic review and dose-response meta-analysis of randomised controlled trials.J Nutr Sci · PMID 40160899
Effect of Green Tea Supplementation on Antioxidant Status in Adults: A Systematic Review and Meta-Analysis of Randomized Clinical Trials.Antioxidants · PMID 34829602
Effect of green tea supplementation on blood pressure in adults: a GRADE-assessed systematic review and dose-response meta-analysis of randomised controlled trials.Blood Press · PMID 40497293
The effects of EGCG on fat oxidation and endurance performance in male cyclistsInt J Sport Nutr Exerc Metab · PMID 20175431
Effect of green tea consumption on blood lipids: a systematic review and meta-analysis of randomized controlled trials.Nutr J · PMID 32434539
Prospective double-blind crossover study of Camellia sinensis (green tea) in dyslipidemiasArq Bras Cardiol · PMID 19838489
Effect of Epigallocatechin Gallate on Glycemic Index: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.Clin Ther · PMID 40885603
Green tea extract ingestion, fat oxidation, and glucose tolerance in healthy humansAm J Clin Nutr · PMID 18326618
Effect of 2-month controlled green tea intervention on lipoprotein cholesterol, glucose, and hormone levels in healthy postmenopausal womenCancer Prev Res · PMID 22246619
Effect of moderate intakes of different tea catechins and caffeine on acute measures of energy metabolism under sedentary conditionsBr J Nutr · PMID 19445822
Influence of short-term consumption of the caffeine-free, epigallocatechin-3-gallate supplement, Teavigo, on resting metabolism and the thermic effect of feedingObesity · PMID 20725062
Epigallocatechin gallate (EGCG) (TEAVIGO) does not impair nonhaem-iron absorption in manPhytomedicine · PMID 16008116
Green tea polyphenols provide photoprotection, increase microcirculation, and modulate skin properties of womenJ Nutr · PMID 21525260
A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled studyJ Med Food · PMID 21303262
Green tea extract decreases starch digestion and absorption from a test meal in humans: a randomized, placebo-controlled crossover studySci Rep · PMID 26226166
Green tea extract supplementation gives protection against exercise-induced oxidative damage in healthy menNutr Res · PMID 22118751
Effect of green tea supplementation on blood pressure among overweight and obese adults: a systematic review and meta-analysis.J Hypertens · PMID 25479028
Effect of green tea supplementation on blood pressure: A systematic review and meta-analysis of randomized controlled trials.Medicine · PMID 32028419
Green tea catechins and blood pressure: a systematic review and meta-analysis of randomised controlled trials.Eur J Nutr · PMID 24861099
Effect of green tea consumption on blood pressure: a meta-analysis of 13 randomized controlled trialsSci Rep · PMID 25176280

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