Green Tea Extract
17 benefits mapped to clinical evidence across supplements.
Dose per serving from products
2,759 products in our catalogue print how much Green Tea Extract a serving holds.
Most common: 50 mg to 100 mg, 25% of 2,759 products.
| Dose per serving | Products |
|---|---|
| 10 mg or less | 95 |
| 10 mg to 25 mg | 272 |
| 25 mg to 50 mg | 673 |
| 50 mg to 100 mg | 683 |
| 100 mg to 250 mg | 633 |
| 250 mg to 500 mg | 315 |
| over 500 mg | 88 |
Dose per serving from research
110 study groups in 81 studies say how much Green Tea Extract participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 250 mg to 500 mg, 36% of 110 study groups.
| Daily dose | Study groups |
|---|---|
| 50 mg or less | 4 |
| 50 mg to 100 mg | 3 |
| 100 mg to 250 mg | 5 |
| 250 mg to 500 mg | 40 |
| 500 mg to 1 g | 31 |
| 1 g to 2.5 g | 22 |
| over 2.5 g | 5 |
Commonly used together
41 of 111 study groups took Green Tea Extract with something else. Shown: what 3 or more different studies gave.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Epigallocatechin Gallate | 11 |
| Caffeine | 9 |
| Vitamin D | 6 |
| Quercetin | 4 |
| Vitamin C | 3 |
Benefit Evidence
Antiviral immunity +20–70%
Warriors, less infections
Gut barrier, microbiota
Energy/fatigue: TTE +1.28
Energy/fatigue: REE +12.4%
Energy/fatigue: sleep +3%
Calmness up; EEG +
Depression scores down, faster
Vitality/general health up
Energy/fatigue: TTE +1.28
Energy/fatigue: REE +12.4%
Energy/fatigue: sleep +3%
Research sources
Antioxidant (21)
- Effects of green tea supplementation on elements, total antioxidants, lipids, and glucose values in the serum of obese patients
PubMed ID: 22581111
Three months of GTE increased total antioxidant status (TAS) and improved oxidative markers in obese subjects.
- Comparative studies on the hypolipidemic, antioxidant and hepatoprotective activities of catechin-enriched green and oolong tea in a double-blind clinical trial
PubMed ID: 29384173
Catechin-enriched tea improved antioxidant indices (TEAC, GSH, SOD, CAT, GPx etc.) in humans over 12 weeks.
- The effects of polyphenol-containing antioxidants on oxidative stress and lipid peroxidation in Type 2 diabetes mellitus without complications
PubMed ID: 19834314
Polyphenol supplement containing green tea extract lowered LDL and a lipid-peroxidation marker in type 2 diabetics (multi-ingredient).
- Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndrome
PubMed ID: 20595643
8-week green tea interventions markedly reduced lipid-peroxidation markers (MDA/HNE) in obese metabolic-syndrome subjects.
- Green tea extracts for the prevention of metachronous colorectal polyps among patients who underwent endoscopic removal of colorectal adenomas: A randomized clinical trial
PubMed ID: 28209333
Reduced colorectal adenoma recurrence over 12 months is consistent with chemopreventive/antioxidant mechanisms.
- Oral preoperative antioxidants in pancreatic surgery: a double-blind, randomized, clinical trial
PubMed ID: 21890323
Perioperative multi‑ingredient supplement (including GTE) improved total endogenous antioxidant capacity shortly after surgery.
- Effect of green tea extract (catechins) in reducing oxidative stress seen in patients of pulmonary tuberculosis on DOTS Cat I regimen
PubMed ID: 19910173
Large human study in TB patients showed robust improvements in multiple oxidative‑stress biomarkers with green tea catechin adjunct.
- Association between soy and green tea (Camellia sinensis) diminishes hypercholesterolemia and increases total plasma antioxidant potential in dyslipidemic subjects
PubMed ID: 18455656
Green tea (±soy) increased total plasma antioxidant potential in dyslipidemic individuals.
- [Study on the preventive effect of tea on DNA damage of the buccal mucosa cells in oral leukoplakias induce by cigarette smoking]
PubMed ID: 10684124
Tea intervention lowered DNA damage markers in oral cells of smokers over 6 months—evidence of antioxidant/protective effect.
- Tea catechin consumption reduces circulating oxidized low-density lipoprotein
PubMed ID: 18160764
High-dose catechins lowered circulating oxidized LDL significantly, a direct oxidative-stress marker.
- Green tea extract reduces blood pressure, inflammatory biomarkers, and oxidative stress and improves parameters associated with insulin resistance in obese, hypertensive patients
PubMed ID: 22749178
GTE improved total antioxidant status and reduced inflammatory markers in obese hypertensives in a double‑blind RCT.
- "Benifuuki" Extract Reduces Serum Levels of Lectin-Like Oxidized Low-Density Lipoprotein Receptor-1 Ligands Containing Apolipoprotein B: A Double-Blind Placebo-Controlled Randomized Trial
PubMed ID: 30029523
Benifuuki (green tea extract) reduced oxidized/modified LDL (LAB), a direct biomarker of oxidative modification.
- Supplementation with Brazil nuts and green tea extract regulates targeted biomarkers related to colorectal cancer risk in humans
PubMed ID: 27923410
GTE altered colon biomarkers (reduced DNMT1, NF‑κB mRNA) linked to inflammation/aging pathways — supportive of antioxidant/anti‑inflammatory roles.
- Redox-linked effects of green tea on DNA damage and repair, and influence of microsatellite polymorphism in HMOX-1: results of a human intervention trial
PubMed ID: 25527735
12‑week trial in T2D showed reduced oxidative DNA damage and increased repair enzymes/HMOX‑1 — robust biomarker support.
- Effects of a green tea extract, Polyphenon E, on systemic biomarkers of growth factor signalling in women with hormone receptor-negative breast cancer
PubMed ID: 24646362
Polyphenon E increased urinary metabolites and reduced HGF; exploratory biomarker changes consistent with systemic bioactivity.
- Randomized clinical trial of brewed green and black tea in men with prostate cancer prior to prostatectomy
PubMed ID: 25545744
Six cups/day of green tea produced tissue catechin uptake and decreased prostate NF‑κB and urinary 8‑OHdG — systemic/tissue antioxidant signals.
- Mitigation of oxidative damage by green tea polyphenols and Tai Chi exercise in postmenopausal women with osteopenia
PubMed ID: 23118932
Large RCT: 6 months of 500 mg/day green tea polyphenols produced large (~60%+) reductions in urinary 8‑OHdG (oxidative DNA damage) — strong antioxidant evidence.
- The Effect of Green Tea and Sour Tea (Hibiscus sabdariffa L.) Supplementation on Oxidative Stress and Muscle Damage in Athletes
PubMed ID: 27736246
Six-week GTE reduced MDA in soccer players (lipid-peroxidation marker), supporting antioxidant activity.
- Green tea supplementation increases glutathione and plasma antioxidant capacity in adults with the metabolic syndrome
PubMed ID: 23507223
8-week RCT in metabolic-syndrome adults: GTE increased whole-blood glutathione and plasma antioxidant capacity — strong clinical antioxidant biomarker evidence.
- Bioavailability and antioxidant activity of tea flavanols after consumption of green tea, black tea, or a green tea extract supplement
PubMed ID: 15585768
GTE capsule enhanced flavanol absorption and produced a small but significant rise in plasma antioxidant activity at 8 h.
- Green tea extract supplementation gives protection against exercise-induced oxidative damage in healthy men
PubMed ID: 22118751
GTE with strength training increased plasma polyphenols and total antioxidant status, and attenuated CK rise.
Healthy aging (14)
- Genomewide association analysis on green tea chemoprevention of colorectal adenoma: the importance of SLCO1A2 variants
PubMed ID: 40433816
GWAS subgroup analysis of the MIRACLE trial found ~18% lower colorectal adenoma risk with GTE in nonvariant SLCO1A2 carriers—suggests age‑related cancer risk modulation in a genetic subgroup.
- Redox-linked effects of green tea on DNA damage and repair, and influence of microsatellite polymorphism in HMOX-1: results of a human intervention trial
PubMed ID: 25527735
Reduced oxidative DNA damage and upregulated repair/protective proteins in T2D may contribute to healthy aging pathways.
- Randomized clinical trial of brewed green and black tea in men with prostate cancer prior to prostatectomy
PubMed ID: 25545744
Tissue uptake of catechins and decreased NF‑κB/oxidative urinary damage suggest mechanisms relevant to healthy aging.
- Mitigation of oxidative damage by green tea polyphenols and Tai Chi exercise in postmenopausal women with osteopenia
PubMed ID: 23118932
Large reduction in oxidative DNA damage biomarker in postmenopausal women suggests green tea polyphenols support cellular aging processes.
- Green tea extract reduces blood pressure, inflammatory biomarkers, and oxidative stress and improves parameters associated with insulin resistance in obese, hypertensive patients
PubMed ID: 22749178
Improvements in BP, insulin resistance, lipids and inflammation in obese hypertensive patients are consistent with interventions that support healthy aging.
- Phase II randomized, placebo-controlled trial of green tea extract in patients with high-risk oral premalignant lesions
PubMed ID: 19892663
Dose-related short-term responses in oral premalignant lesions indicate possible chemopreventive aging benefits (no cancer-free survival benefit shown).
- Green tea extracts for the prevention of metachronous colorectal adenomas: a pilot study
PubMed ID: 18990744
Randomized pilot trial halved 1-year colorectal adenoma recurrence, a meaningful chemopreventive/aging-related outcome.
- Cholesterol-lowering effect of a theaflavin-enriched green tea extract: a randomized controlled trial
PubMed ID: 12824094
Significant LDL and total cholesterol reductions with theaflavin‑enriched GTE support long‑term cardiovascular health relevant to healthy aging.
- [Study on the preventive effect of tea on DNA damage of the buccal mucosa cells in oral leukoplakias induce by cigarette smoking]
PubMed ID: 10684124
Reduced buccal cell DNA damage in smokers with tea intervention implies protective effects relevant to aging.
- Green tea extracts for the prevention of metachronous colorectal polyps among patients who underwent endoscopic removal of colorectal adenomas: A randomized clinical trial
PubMed ID: 28209333
Significant reduction in metachronous colorectal adenomas suggests a preventive effect relevant to healthy aging.
- Tea-induced improvement of endothelial function in humans: No role for epigallocatechin gallate (EGCG)
PubMed ID: 28536463
Green tea beverage improved FMD in healthy men; vascular benefits relate to healthy aging.
- Short- and long-term black tea consumption reverses endothelial dysfunction in patients with coronary artery disease
PubMed ID: 11447078
Improved endothelial function in coronary artery disease patients supports cardiovascular health — a credible mechanism for healthy aging.
- Green tea catechins improve human forearm endothelial dysfunction and have antiatherosclerotic effects in smokers
PubMed ID: 20134098
High-dose GTC improved endothelial-dependent vasodilation and reduced oxidative/inflammatory biomarkers in smokers — vascular benefits relevant to healthy aging.
- Supplementation with Brazil nuts and green tea extract regulates targeted biomarkers related to colorectal cancer risk in humans
PubMed ID: 27923410
GTE altered colorectal biomarkers (DNMT1, NF‑κB) implicated in aging/cancer risk modulation.
Weight management (15)
- Effects of green tea extract on insulin resistance and glucagon-like peptide 1 in patients with type 2 diabetes and lipid abnormalities: a randomized, double-blinded, and placebo-controlled trial
PubMed ID: 24614112
16-week decaffeinated GTE in T2D produced modest within-group improvements in triglycerides, insulin and HOMA-IR—supportive of metabolic aids to weight management.
- Effect of green tea (Camellia sinensis) consumption on the components of metabolic syndrome in elderly
PubMed ID: 23131813
Randomized trial: 2 months of green tea reduced weight (−1.2 kg), BMI and waist circumference in elderly with metabolic syndrome — direct, clinically meaningful.
- Greenselect Phytosome as an adjunct to a low-calorie diet for treatment of obesity: a clinical trial
PubMed ID: 19594224
Open-label trial reported markedly greater weight loss with a bioavailable GTE plus low-calorie diet (large magnitude but non-blinded).
- A green tea extract high in catechins reduces body fat and cardiovascular risks in humans
PubMed ID: 17557985
Large RCT showed significant reductions in body weight, body fat (visceral and subcutaneous) with high-catechin GTE.
- Green tea extract outperforms metformin in lipid profile and glycaemic control in overweight women: A double-blind, placebo-controlled, randomized trial
PubMed ID: 29415825
Randomized trial showed improved fasting glucose and reduced total cholesterol/LDL and metabolic improvements vs control.
- The Effect of Dietary Supplements Containing Green Tea, Capsaicin and Ginger Extracts on Weight Loss and Metabolic Profiles in Overweight Women: A Randomized Double-Blind Placebo-Controlled Clinical Trial
PubMed ID: 28595182
Combined supplement containing green tea produced modest but significant weight and BMI reductions in overweight women.
- Comparative studies on the hypolipidemic, antioxidant and hepatoprotective activities of catechin-enriched green and oolong tea in a double-blind clinical trial
PubMed ID: 29384173
12-week catechin-enriched green tea reduced weight/BMI and body fat in mildly hypercholesterolemic adults.
- Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndrome
PubMed ID: 20595643
8-week green tea beverage/extract produced clinically meaningful weight loss in obese metabolic-syndrome subjects.
- Therapeutic effect of high-dose green tea extract on weight reduction: A randomized, double-blind, placebo-controlled clinical trial
PubMed ID: 26093535
12-week RCT in centrally obese women produced modest but significant weight, BMI and waist reductions and favorable hormones.
- Effect of epigallocatechin gallate on the body composition and lipid profile of down syndrome individuals: Implications for clinical management
PubMed ID: 31229326
One-year trial in Down syndrome adults modestly prevented weight/BMI gain (notably in males).
- Effects of Greenselect Phytosome® on weight maintenance after weight loss in obese women: a randomized placebo-controlled study
PubMed ID: 27450231
Enhanced-bioavailability green tea phytosome improved short-term weight-loss maintenance vs placebo in randomized trial.
- Effects of catechin enriched green tea on body composition
PubMed ID: 19680234
Large RCT: high-catechin green tea drinks produced modest but significant reductions in abdominal fat, waist and weight over 90 days.
- Effects of Oligonol(®) Supplementation on Abdominal Fat in Japanese Overweight Volunteers: A Randomized, Double-Blind, Placebo-Controlled, Parallel Group Study
PubMed ID: 40887285
12‑week RCT showed significant visceral fat and body weight/BMI reduction with Oligonol (lychee + tea polyphenols) in overweight adults — directly relevant to weight management; product differs from pure green tea extract, so evidence is strong but not identical.
- Effects of green tea extract supplementation and endurance training on irisin, pro-inflammatory cytokines, and adiponectin concentrations in overweight middle-aged men
PubMed ID: 32095935
GTE combined with endurance training produced larger reductions in bodyweight, body fat and visceral fat vs training alone.
- Does green tea extract enhance the anti-inflammatory effects of exercise on fat loss?
PubMed ID: 31747468
GTE (500 mg/d) plus exercise improved weight/fat loss and anti-inflammatory markers more than exercise alone in overweight women.
Immune support (11)
- A Mixed Flavonoid-Fish Oil Supplement Induces Immune-Enhancing and Anti-Inflammatory Transcriptomic Changes in Adult Obese and Overweight Women-A Randomized Controlled Trial
PubMed ID: 27187447
Mixed flavonoid–fish oil supplement containing EGCG upregulated interferon-signaling genes and altered immune-related transcripts.
- A randomized clinical study of tea catechin inhalation effects on methicillin-resistant Staphylococcus aureus in disabled elderly patients
PubMed ID: 16461248
Inhaled tea-catechin solution significantly reduced MRSA counts in sputum over 7 days in elderly patients.
- Effect of green tea extract (catechins) in reducing oxidative stress seen in patients of pulmonary tuberculosis on DOTS Cat I regimen
PubMed ID: 19910173
GTE adjunct improved oxidative‐stress biomarkers in TB patients, suggesting support for host defenses during infection.
- HTLV-1 provirus load in peripheral blood lymphocytes of HTLV-1 carriers is diminished by green tea drinking
PubMed ID: 15245597
High‑dose GTE significantly lowered HTLV‑1 provirus load over 5 months—strong evidence of antiviral/immune activity in this dataset.
- A randomized, double-blind, four-arm parallel-group, placebo-controlled Phase II/III study to investigate the clinical efficacy of two galenic formulations of Polyphenon E in the treatment of external genital warts
PubMed ID: 17958849
Topical green tea ointment significantly cleared external genital warts vs placebo in a randomized trial.
- Sinecatechins, a defined green tea extract, in the treatment of external anogenital warts: a randomized controlled trial
PubMed ID: 18515521
Large RCT: topical sinecatechins (green tea extract) markedly increased clearance of anogenital warts, demonstrating antiviral/immune activity.
- Topical Polyphenon E in the treatment of external genital and perianal warts: a randomized controlled trial
PubMed ID: 18363746
Large RCT of topical Polyphenon E also showed significant wart clearance vs vehicle, confirming topical antiviral efficacy.
- Effects of green tea catechins and theanine on preventing influenza infection among healthcare workers: a randomized controlled trial
PubMed ID: 21338496
Large RCT: 5 months of green tea catechins + theanine significantly reduced clinically defined influenza incidence and prolonged time free of influenza in healthcare workers.
- A Randomized, Double-blind, Placebo-controlled Clinical Trial Examining the Effects of Green Tea Extract on Systemic Lupus Erythematosus Disease Activity and Quality of Life
PubMed ID: 28585735
12‑week RCT in SLE showed reduced disease activity and improved QOL — suggests immunomodulatory effects in autoimmune disease.
- Effectiveness of topical green tea against multidrug-resistant Staphylococcus aureus in cases of primary pyoderma: An open controlled trial
PubMed ID: 29146890
Topical 3% green tea ointment cured most community pyoderma including MRSA with potent in vitro antibacterial activity—strong immune/antimicrobial relevance.
- Effect of Catechins on Upper Respiratory Tract Infections in Winter: A Randomized, Placebo-Controlled, Double-Blinded Trial
PubMed ID: 35565823
Large RCT: daily catechin beverage substantially reduced duration/severity of URTI symptoms — strong evidence for immune resilience.
Metabolism (14)
- The Effect of Dietary Supplements Containing Green Tea, Capsaicin and Ginger Extracts on Weight Loss and Metabolic Profiles in Overweight Women: A Randomized Double-Blind Placebo-Controlled Clinical Trial
PubMed ID: 28595182
Green tea–containing supplement produced weight loss and improved insulin sensitivity (HOMA-IR), indicating metabolic boosting effects.
- Effects of green tea supplementation on elements, total antioxidants, lipids, and glucose values in the serum of obese patients
PubMed ID: 22581111
GTE improved lipids, slightly lowered fasting glucose and increased TAS in obese subjects—clear metabolic effects.
- Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndrome
PubMed ID: 20595643
Weight/BMI reductions and lowered lipid-peroxidation in metabolic-syndrome subjects indicate metabolic improvement.
- Comparative studies on the hypolipidemic, antioxidant and hepatoprotective activities of catechin-enriched green and oolong tea in a double-blind clinical trial
PubMed ID: 29384173
Significant improvements in body composition, lipids and hepatic steatosis indicate a metabolic benefit from catechin-enriched tea.
- Effects of green tea extract supplementation and endurance training on irisin, pro-inflammatory cytokines, and adiponectin concentrations in overweight middle-aged men
PubMed ID: 32095935
GTE with endurance training produced larger decreases in inflammatory markers and body fat, and increased adiponectin and irisin—metabolic benefits.
- Does green tea extract enhance the anti-inflammatory effects of exercise on fat loss?
PubMed ID: 31747468
GTE plus exercise improved body composition and anti-inflammatory markers vs exercise alone, indicating enhanced metabolic response.
- Effects of green tea extract on insulin resistance and glucagon-like peptide 1 in patients with type 2 diabetes and lipid abnormalities: a randomized, double-blinded, and placebo-controlled trial
PubMed ID: 24614112
Decaf GTE improved insulin, HOMA‑IR and TG in T2D—evidence for metabolic improvement.
- Effect of green tea (Camellia sinensis) consumption on the components of metabolic syndrome in elderly
PubMed ID: 23131813
Green tea intake for 60 days reduced weight, BMI and waist circumference in metabolic‑syndrome elderly — direct metabolic improvements.
- Green tea extract reduces blood pressure, inflammatory biomarkers, and oxidative stress and improves parameters associated with insulin resistance in obese, hypertensive patients
PubMed ID: 22749178
GTE improved insulin sensitivity, lipids and BP in obese hypertensives — supports a metabolic‑boosting profile.
- Randomized controlled trial for an effect of green tea-extract powder supplementation on glucose abnormalities
PubMed ID: 17554248
Crossover RCT found HbA1c reduction in borderline-diabetics, indicating metabolic glucose-handling benefits.
- A green tea extract high in catechins reduces body fat and cardiovascular risks in humans
PubMed ID: 17557985
Large RCT showing body-fat and visceral-fat reductions and cardiometabolic marker improvements indicates metabolic stimulation by catechins.
- Green tea extract outperforms metformin in lipid profile and glycaemic control in overweight women: A double-blind, placebo-controlled, randomized trial
PubMed ID: 29415825
RCT showed improved fasting glucose and lowered total/LDL cholesterol, indicating metabolic benefit.
- A green tea extract confection decreases circulating endotoxin and fasting glucose by improving gut barrier function but without affecting systemic inflammation: A double-blind, placebo-controlled randomized trial in healthy adults and adults with metabolic syndrome
PubMed ID: 38430822
Lower serum endotoxin and fasting glucose suggest improved metabolic and gut‑metabolic function.
- Therapeutic effect of high-dose green tea extract on weight reduction: A randomized, double-blind, placebo-controlled clinical trial
PubMed ID: 26093535
High-dose GTE over 12 weeks produced modest weight loss, waist reduction and favorable metabolic hormone changes.
Oral health (12)
- Efficacy of green tea and its extract, epigallocatechin-3-gallate, in the reduction of cariogenic microbiota in children: a randomized clinical trial
PubMed ID: 32361019
Single‑rinse RCT in children showed large immediate reductions in mutans streptococci and lactobacilli compared with water/tea.
- Comparison of the Streptococcus mutans and Lactobacillus colony count changes in saliva following chlorhexidine (0.12%) mouth rinse, combination mouth rinse, and green tea extract (0.5%) mouth rinse in children
PubMed ID: 28492194
Daily supervised rinsing with 0.5% GTE reduced cariogenic bacteria in children (less than CHX) — supports reduced oral bacterial load and fresher breath.
- Preliminary Clinical Evidence of the Antiplaque, Antigingivitis Efficacy of a Mouthwash Containing 2% Green Tea - A Randomised Clinical Trial
PubMed ID: 25610918
Large RCT: twice‑daily 2% green tea mouthwash for 28 days significantly reduced plaque and gingivitis versus placebo — strong local oral health evidence supporting fresher breath.
- Comparison of the effectiveness of 0.5% tea, 2% neem and 0.2% chlorhexidine mouthwashes on oral health: a randomized control trial
PubMed ID: 23852229
0.5% tea mouthwash reduced plaque and gingival inflammation and increased salivary pH more than comparators over weeks — strong topical oral health evidence relevant to breath.
- Antimicrobial properties of green tea extract against cariogenic microflora: an in vivo study
PubMed ID: 21612452
Daily GTE mouth rinses for 1 week reduced cariogenic bacteria counts in adolescents compared with placebo — supports oral microbial control relevant to breath freshness.
- Potential use of tea extract as a complementary mouthwash: comparative evaluation of two commercial samples
PubMed ID: 11719944
Hot‑water extracts of commercial teas reduced oral bacterial counts for up to 60 minutes after gargling—direct oral antimicrobial effect.
- Comparison of the Streptococcus mutans colony count changes in plaque following chlorhexidine (0.12%) mouth rinse and green tea extract (0.5%) mouth rinse in 8-12-year-old children
PubMed ID: 34810350
0.5% GTE mouth rinse reduced Streptococcus mutans as effectively as chlorhexidine in children—supports oral antimicrobial effects tied to breath freshness.
- Reduction of dental plaque deposition in humans by oolong tea extract
PubMed ID: 8033186
Small controlled trial showed oolong tea extract mouthrinse significantly reduced dental plaque after 4 days, a direct oral benefit that plausibly supports fresher breath; topical oolong (not green tea extract) was tested.
- A phase II clinical trial of a natural formulation containing tea catechins for xerostomia
PubMed ID: 25240992
Catechin-containing formulation substantially increased unstimulated and stimulated saliva output — increased salivation can reduce halitosis risk.
- Effect of Green Tea-Added Tablets on Volatile Sulfur-Containing Compounds in the Oral Cavity
PubMed ID: 28391664
Double-blind crossover: green-tea-extract tablets significantly and immediately lowered oral volatile sulfur compounds vs placebo — strong, direct halitosis benefit.
- Clinical efficacy of green tea, aloe vera and chlorhexidine mouthwashes in the treatment of dental biofilm induced gingivitis: A multi-arm, double-blinded, randomized controlled clinical trial
PubMed ID: 36583292
Randomized trial: 0.5% green-tea mouthwash significantly reduced plaque, gingival inflammation and bleeding vs control — direct, clinically relevant oral-health benefit that can improve breath.
- The effect of sugar-free green tea chew candies on the degree of inflammation of the gingiva
PubMed ID: 11121366
Chewing sugar‑free green tea candies for 4 weeks modestly reduced plaque and gingival bleeding—local oral health benefit that supports fresher breath.
Skin appearance (8)
- Effect of a novel dietary supplement on skin aging in post-menopausal women
PubMed ID: 16670692
Oral cosmetic supplement containing white tea (Camellia sinensis) improved facial wrinkles and ultrasound skin density, though multi-ingredient.
- The antibacterial activity of tea in vitro and in vivo (in patients with impetigo contagiosa)
PubMed ID: 11138536
Topical crude tea achieved high cure rates for impetigo, demonstrating tangible skin‑healing/antimicrobial benefits in a clinical series.
- Double-blinded, placebo-controlled trial of green tea extracts in the clinical and histologic appearance of photoaging skin
PubMed ID: 16029678
Combined oral+topical green tea produced histologic increases in skin elastic tissue, a structural marker for skin appearance.
- Effectiveness of topical green tea against multidrug-resistant Staphylococcus aureus in cases of primary pyoderma: An open controlled trial
PubMed ID: 29146890
Topical 3% green tea ointment cured 86% of pyoderma cases vs 6.6% for placebo—strong clinical skin benefit.
- Efficacy of sinecatechins 10% as proactive sequential therapy of external genital warts after laser CO(2) ablative therapy: The PACT study (post-ablation immunomodulator treatment of condylomata with sinecatechins): a randomized, masked outcome assessment, multicenter trial
PubMed ID: 30236042
Applying 10% sinecatechins after CO2 laser lowered short-term wart recurrence markedly—clinically meaningful topical benefit.
- Clinical Effectiveness of Green Tea Extracts as a Local Haemostatic Agent Following Mandibular Molar Extraction
PubMed ID: 39491445
GTE (especially tannin isolate) sharply reduced bleeding time after extraction, implying strong topical hemostatic/healing action relevant to skin/wound appearance.
- Treatment of acne vulgaris with 2% topical tea lotion
PubMed ID: 16432600
Topical 2% tea lotion applied twice daily for 8 weeks reduced acne lesion counts and increased patient satisfaction vs control — solid topical skin benefit.
- Does supplementation with green tea extract improve acne in post-adolescent women? A randomized, double-blind, and placebo-controlled clinical trial
PubMed ID: 27062963
4-week RCT of decaffeinated GTE reduced some facial inflammatory acne lesions and lowered total cholesterol within-group.
Vitality (5)
- Green tea extract reduces blood pressure, inflammatory biomarkers, and oxidative stress and improves parameters associated with insulin resistance in obese, hypertensive patients
PubMed ID: 22749178
3‑month GTE trial improved BP, insulin resistance, lipids, inflammation and antioxidant status — broad cardiometabolic benefits consistent with enhanced vitality.
- A Randomized, Double-blind, Placebo-controlled Clinical Trial Examining the Effects of Green Tea Extract on Systemic Lupus Erythematosus Disease Activity and Quality of Life
PubMed ID: 28585735
Randomized trial in systemic lupus showed significant increases in vitality and general health scores with GTE.
- Green tea extract for mild-to-moderate diabetic peripheral neuropathy A randomized controlled trial
PubMed ID: 33517103
Large RCT: 16 weeks GTE improved pain and neurophysiological measures in diabetic neuropathy—likely to improve daily functioning and vitality.
- Short- and long-term black tea consumption reverses endothelial dysfunction in patients with coronary artery disease
PubMed ID: 11447078
Black tea improved endothelial function in CAD patients; better vascular function can support vitality (tea-family effect).
- Effects of green tea catechins and theanine on preventing influenza infection among healthcare workers: a randomized controlled trial
PubMed ID: 21338496
Daily catechin+theanine reduced influenza incidence in healthcare workers — improved resistance to infection supports overall vitality.
Focus & concentration (5)
- 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
PubMed ID: 27302362
RCT showed improved attention/inhibitory control measures with EGCG plus cognitive training.
- Effects of the active botanical blend "WKUP GT" on attention and cognitive functions after lunch in healthy volunteers
PubMed ID: 38367243
Crossover trial with beverage containing GTE showed improved attention and multitasking—direct evidence for concentration benefits.
- L-theanine, a natural constituent in tea, and its effect on mental state
PubMed ID: 18296328
L-theanine increased alpha activity linked to focused yet relaxed attention—supports sharper focus potential.
- A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled study
PubMed ID: 21303262
GTE + L‑theanine trial produced modest improvements in selective attention and memory measures (particularly in more impaired subgroup).
- Effects of Heat-Treated Green Tea Extract on Memory Function and Default Mode Network Connectivity in Individuals with Subjective Memory Impairment: A Randomized, Double-Blinded, Placebo-Controlled Trial
PubMed ID: 40272820
Heat‑treated GTE improved memory and DMN connectivity in an RCT—findings support better sustained cognitive performance and concentration.
Mental clarity (5)
- Effects of Heat-Treated Green Tea Extract on Memory Function and Default Mode Network Connectivity in Individuals with Subjective Memory Impairment: A Randomized, Double-Blinded, Placebo-Controlled Trial
PubMed ID: 40272820
12‑week RCT: heat‑treated GTE improved memory composite scores and increased DMN connectivity in subjects with subjective memory complaints—direct cognitive benefit.
- A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled study
PubMed ID: 21303262
Green tea extract + L‑theanine produced modest improvements in memory/attention and acute EEG changes in MCI patients — supports cognitive clarity in some participants.
- L-theanine, a natural constituent in tea, and its effect on mental state
PubMed ID: 18296328
Single-dose L-theanine increased EEG alpha activity consistent with relaxed alertness and improved subjective mental clarity.
- 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
PubMed ID: 27302362
Phase 2 RCT in young adults with Down syndrome showed significant improvements in memory and attention measures with EGCG+training.
- Effects of the active botanical blend "WKUP GT" on attention and cognitive functions after lunch in healthy volunteers
PubMed ID: 38367243
Low-caffeine beverage containing GTE improved attention, multitasking and some memory measures in a crossover trial.
Detoxification (4)
- Green Tea Extract Increases Soluble RAGE and Improves Renal Function in Patients with Diabetic Nephropathy
PubMed ID: 34788550
GTE improved GFR in people with diabetic nephropathy (+~7.9%), directly relevant to renal clearance and 'detox' support.
- High performance liquid chromatography tandem mass spectrometry dual extraction method for identification of green tea catechin metabolites excreted in human urine
PubMed ID: 25306116
Comprehensive urinary profiling shows extensive conjugation and excretion of catechin metabolites — direct evidence of systemic metabolism/excretion.
- Randomized clinical trial of brewed green and black tea in men with prostate cancer prior to prostatectomy
PubMed ID: 25545744
Urinary 8‑OHdG decreased and tissue uptake of catechins demonstrated systemic exposure and removal of oxidative damage markers.
- A green tea extract confection decreases circulating endotoxin and fasting glucose by improving gut barrier function but without affecting systemic inflammation: A double-blind, placebo-controlled randomized trial in healthy adults and adults with metabolic syndrome
PubMed ID: 38430822
Catechin-rich GTE reduced circulating endotoxin (LPS) and fasting glucose, suggesting improved gut barrier and 'detox' capacity.
Exercise recovery (3)
- Effect of green tea and Tai Chi on bone health in postmenopausal osteopenic women: a 6-month randomized placebo-controlled trial
PubMed ID: 21766228
GTP supplementation improved leg strength in postmenopausal women, consistent with better functional recovery/adaptation.
- Green tea extract supplementation gives protection against exercise-induced oxidative damage in healthy men
PubMed ID: 22118751
GTE + strength training attenuated rise in CK (marker of muscle damage), supporting recovery.
- Polyphenol supplementation alters intramuscular apoptotic signaling following acute resistance exercise
PubMed ID: 29380956
Tea polyphenol blend modulated exercise-induced muscle apoptotic signaling after damaging resistance exercise, suggesting improved early recovery mechanisms.
Energy & Fatigue (3)
- Effect of green tea on reward learning in healthy individuals: a randomized, double-blind, placebo-controlled pilot study
PubMed ID: 23777561
Five‑week oral green tea powder improved reward‑learning reaction times and modestly lowered depression scores, which could translate into steadier subjective energy in healthy adults.
- A Randomized, Double-blind, Placebo-controlled Clinical Trial Examining the Effects of Green Tea Extract on Systemic Lupus Erythematosus Disease Activity and Quality of Life
PubMed ID: 28585735
Randomized trial in SLE reported improved vitality and general health scores, consistent with reduced fatigue in a chronic condition.
- Hyperoside-Rich Blueberry Leaf Tea Improves Sleep Continuity in Adults with Poor Sleep: A Two-Week Randomized Double-Blind Controlled Trial
PubMed ID: 41683277
Reducing wake after sleep onset and increasing sleep efficiency in the RCT suggests decreased daytime fatigue potential; study used blueberry leaf tea rather than green tea extract.
Appetite regulation (2)
- Effects of green tea extract on insulin resistance and glucagon-like peptide 1 in patients with type 2 diabetes and lipid abnormalities: a randomized, double-blinded, and placebo-controlled trial
PubMed ID: 24614112
Decaffeinated GTE raised GLP‑1 and improved insulin markers—GLP‑1 increase is directly relevant to appetite regulation.
- Therapeutic effect of high-dose green tea extract on weight reduction: A randomized, double-blind, placebo-controlled clinical trial
PubMed ID: 26093535
Study reported decreased ghrelin and increased adiponectin, consistent with appetite/metabolic hormone modulation.
Mood balance (2)
- Effect of green tea on reward learning in healthy individuals: a randomized, double-blind, placebo-controlled pilot study
PubMed ID: 23777561
Randomized double‑blind pilot: 5 weeks of green tea powder modestly lowered MADRS and HRSD scores and improved reward learning — direct mood benefit evidence.
- A Randomized, Double-blind, Placebo-controlled Clinical Trial Examining the Effects of Green Tea Extract on Systemic Lupus Erythematosus Disease Activity and Quality of Life
PubMed ID: 28585735
GTE reduced disease activity and improved vitality/general health in SLE, which included mood‑related quality‑of‑life improvements.
Alertness (2)
- Effects of the active botanical blend "WKUP GT" on attention and cognitive functions after lunch in healthy volunteers
PubMed ID: 38367243
Product with low caffeine and GTE improved attention and multitasking—supports increased alertness.
- L-theanine, a natural constituent in tea, and its effect on mental state
PubMed ID: 18296328
L-theanine produced EEG changes reflecting relaxed alertness; supports alertness when combined with tea's caffeine in typical use.
Bloating & gas (1)
- A green tea extract confection decreases circulating endotoxin and fasting glucose by improving gut barrier function but without affecting systemic inflammation: A double-blind, placebo-controlled randomized trial in healthy adults and adults with metabolic syndrome
PubMed ID: 38430822
Reduced circulating endotoxin suggests improved gut barrier function, plausibly reducing bloating symptoms.
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Products with Green Tea Extract
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Being studied right now
Recruiting clinical trials registered on ClinicalTrials.gov. A trial in progress has no result yet — this is what the field is asking, not what it found.