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Head-to-head evidence comparison — which supplement is right for you?
Green Tea Extract wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
12 of 13 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
8 of 10 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Glucomannan and Green Tea Extract have evidence — compare verdict strength side-by-side.
1g three times daily before meals (3g total)
30-60 minutes before meals, With 1-2 glasses of water, Before largest meals for weight loss
Capsules (safest)
250-500mg EGCG (or 500-1000mg green tea extract)
With meals, Morning or pre-exercise
Standardized extract (45-50% EGCG)
30-60 minutes
4-8 weeks
4-8 weeks
If improperly taken
Acute and 4-8 weeks
Acute
30-60 minutes
Effect of glucomannan on plasma lipid and glucose concentrations, body weight, and blood pressure: systematic review and meta-analysis
The American journal of clinical nutrition (2008) · Meta analysis · n=531
Glucomannan appears to beneficially affect total cholesterol, LDL cholesterol, triglycerides, body weight, and FBG, but not HDL cholesterol or BP.
The Impact of Glucomannan, Inulin, and Psyllium Supplementation (Soloways(TM)) on Weight Loss in Adults with FTO, LEP, LEPR, and MC4R Polymorphisms: A Randomized, Double-Blind, Placebo-Controlled Trial
Nutrients (2024) · Rct · n=112
The experimental group showed significant reductions in body weight (treatment difference: -4.9%; 95% CI: -6.9% to -2.9%; p < 0.01) and BMI (treatment difference: -1.4 kg/m2; 95% CI: -1.7 to -1.2; p < 0.01) compared to placebo.
Comparative effects of nutraceuticals on body weight in adults with overweight or obesity: A systematic review and network meta-analysis of 111 randomized clinical trials
Pharmacological research (2023) · Meta analysis · n=6171
We conducted random-effects network meta-analysis with a Frequentist framework to estimate mean difference [MD] and 95% confidence interval [CI] of the effect of nutraceuticals on weight loss.
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.
Meta-analysis of 6 RCTs (n=225) showed modest but significant weight reduction vs placebo. Effects appear greater in females. Limited long-term data available.
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 6.5/10) and wins in 1 of 3 categories.
For reduce inflammation, Green Tea Extract has a higher relevance score (85 vs 65).
No known interactions between Glucomannan and Green Tea Extract have been documented in our database. However, always consult a healthcare provider before combining supplements.