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Head-to-head evidence comparison — which supplement is right for you?
Green Tea Extract wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
8 of 10 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Green Tea Extract and Gymnema Sylvestre have evidence — compare verdict strength side-by-side.
250-500mg EGCG (or 500-1000mg green tea extract)
With meals, Morning or pre-exercise
Standardized extract (45-50% EGCG)
200-400mg standardized extract (≥25% gymnemic acids) 1-2x daily, or 2-4g dried leaf
with-meals
Standardized extract (≥25% gymnemic acids)
Acute and 4-8 weeks
Acute
30-60 minutes
8-12 weeks
Immediate-2 weeks
8-12 weeks
Days
Green tea (Camellia sinensis) for the prevention of cancer
The Cochrane database of systematic reviews (2020) · Meta analysis · n=1795
For incident prostate cancer, the summary risk ratio (RR) in the green tea-supplemented participants was 0.50 (95% confidence interval (CI) 0.18 to 1.36), based on three studies and involving 201 participants (low-certainty evidence).
Impact of flavan-3-ols on blood pressure and endothelial function in diverse populations: a systematic review and meta-analysis of randomized controlled trials
European journal of preventive cardiology (2025) · Meta analysis · n=5205
Flavan-3-ol interventions included epicatechin, epigallocatechin-gallate, cocoa products, tea, grape extract, and apples delivering 586 mg (95% CI 510, 662) total flavan-3-ols.
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
The British journal of nutrition (2024) · Meta analysis · n=3802
Pooled effect sizes indicated that BM, BFP, BMI and MDA significantly reduced following GTE supplementation.
The effect of Gymnema sylvestre supplementation on glycemic control in type 2 diabetes patients: A systematic review and meta-analysis.
Phytotherapy research : PTR (2021) · Meta analysis
Significant reductions in fasting blood glucose and HbA1c versus control
The effects of Gymnema Sylvestre supplementation on lipid profile, glycemic control, blood pressure, and anthropometric indices in adults: A systematic review and meta-analysis.
Phytotherapy research : PTR (2023) · Meta analysis
Reductions in fasting glucose and improvements in lipid profile
A systematic review of Gymnema sylvestre in obesity and diabetes management.
Journal of the science of food and agriculture (2014) · Systematic review
Possible benefits for glycemic control and body weight
Based on meta-analysis showing 9.29 mg/dl LDL reduction with 107-856 mg/d EGCG. Optimal cardiovascular benefits observed at 400-500 mg/day. Take with food to reduce GI side effects.
AI-estimated from published studies. Interpret as directional guidance.
Green Tea Extract has a higher evidence score (7.5/10 vs 5.5/10) and wins in 2 of 3 categories.
For manage blood sugar, Gymnema Sylvestre has a higher relevance score (82 vs 50).
No known interactions between Green Tea Extract and Gymnema Sylvestre have been documented in our database. However, always consult a healthcare provider before combining supplements.