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Head-to-head evidence comparison — which supplement is right for you?
Spearmint vs Tamoxifen (Nolvadex): Spearmint has the stronger overall evidence (6.2 vs 5.2/10); the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Spearmint wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (1)
Outcomes where both Spearmint and Tamoxifen (Nolvadex) have evidence — compare verdict strength side-by-side.
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)
Approved (oncology) / off-label (male) — clinician-directed. For ER-positive breast cancer the standard adjuvant dose is 20 mg once daily for 5-10 years. For off-label male gynecomastia, the randomized trials used roughly 10-20 mg daily (10 mg/day prophylactically alongside an antiandrogen, 20 mg/day to treat established gynecomastia). For idiopathic male infertility, the trials typically used 20 mg/day. Bodybuilding 'post-cycle therapy' commonly uses 10-40 mg/day tapered — a use with no controlled-trial evidence. There is no FDA-approved male dose.
Any time of day
Tamoxifen citrate tablets (approved for breast cancer; off-label in men)
2–4 weeks
4–12 weeks
4–8 weeks
8–16 weeks
Years
Weeks to months
Weeks to a few months
Throughout use
An evidence-based systematic review of spearmint by the natural standard research collaboration.
Journal of dietary supplements (2010) · Systematic review
An evidence-based systematic review of spearmint (Mentha spicata, Mentha viridis) including written and statistical analysis of scientific literature, expert opinion, folkloric precedent, history, pharmacology, kinetics/dynamics, interactions, adverse effects, toxicology, and dosing.
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 is listed among several herbal options the authors call effective for mild to moderate nausea and vomiting of pregnancy.
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 women with PCOS completed this 30-day RCT comparing spearmint tea twice daily with a placebo herbal tea.
Relevance of breast cancer hormone receptors and other factors to the efficacy of adjuvant tamoxifen: patient-level meta-analysis of randomised trials.
Lancet (2011) · Meta analysis
EBCTCG patient-level meta-analysis of randomized adjuvant-tamoxifen trials; ER-positive disease cohort n=10,645
Tamoxifen for prevention of breast cancer: report of the National Surgical Adjuvant Breast and Bowel Project P-1 Study.
J Natl Cancer Inst (1998) · Rct · n=13388
NSABP P-1: randomized, placebo-controlled prevention trial of 20 mg/day tamoxifen for 5 years in 13,388 women at increased breast-cancer risk
A randomized trial comparing tamoxifen therapy vs. tamoxifen prophylaxis in bicalutamide-induced gynecomastia.
Clin Genitourin Cancer (2012) · Rct · n=176
Randomized multicenter trial in 176 men on bicalutamide monotherapy for prostate cancer: reactive tamoxifen 20 mg/day (arm A) vs prophylactic tamoxifen 10 mg/day started with bicalutamide (arm B)
Both points come from one 90-day RCT in 90 adults with age-associated memory impairment, 30 per arm, at 0, 600 or 900 mg of extract a day (PMID 29314866). Quality of working memory improved by 15% and spatial working memory accuracy by 9% versus placebo at 900 mg only, so 600 mg is plotted as no effect. The same trial found no effect of either dose on safety markers over 90 days (PMID 28286189). No dose above 900 mg was tested, and the effect may be smaller in people without memory complaints.
AI-estimated from published studies. Interpret as directional guidance.
Spearmint has a higher evidence score (6.2/10 vs 5.2/10) and wins in 2 of 3 categories.
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.