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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 (2)
Outcomes where both Green Tea Extract and Spearmint 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)
900 mg/day of standardized spearmint extract (or 2 cups of spearmint herbal tea daily)
Morning with breakfast, Evening with dinner (split dosing mirrors clinical trial protocols)
Standardized aqueous extract (high-rosmarinic acid)
Acute and 4-8 weeks
Acute
30-60 minutes
2–4 weeks
4–12 weeks
4–8 weeks
8–16 weeks
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.
An evidence-based systematic review of spearmint by the natural standard research collaboration.
Journal of dietary supplements (2010) · Systematic review
Spearmint (Mentha spicata) has demonstrated anti-androgenic, antimicrobial, and antioxidant properties in available literature.
A systematic review of the efficacy of alternative medicine in the treatment of nausea and vomiting of pregnancy.
Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology (2020) · Systematic review
Spearmint syrup was identified as one of several herbal alternatives showing efficacy for mild-to-moderate pregnancy nausea and vomiting.
Spearmint herbal tea has significant anti-androgen effects in polycystic ovarian syndrome. A randomized controlled trial.
Phytotherapy research : PTR (2010) · Rct · n=42
Forty-one of 42 patients completed this 30-day RCT comparing spearmint tea twice daily to placebo herbal tea.
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.
Based on 2 RCTs in women with PCOS/hirsutism. Tea form equivalent to ~400-600mg extract. Effects specific to women; men should avoid chronic high-dose use.
AI-estimated from published studies. Interpret as directional guidance.
Green Tea Extract has a higher evidence score (7.5/10 vs 6.2/10) and wins in 2 of 3 categories.
For estrogen & progesterone balance, Spearmint has a higher relevance score (88 vs 70).
No known interactions between Green Tea Extract and Spearmint have been documented in our database. However, always consult a healthcare provider before combining supplements.