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Head-to-head evidence comparison — which supplement is right for you?
Spearmint wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Letrozole and Spearmint have evidence — compare verdict strength side-by-side.
Indication-specific and clinician-directed. Ovulation induction: 2.5-7.5 mg once daily for 5 days early in the cycle (typically days 3-7). Breast cancer: 2.5 mg once daily continuously. Off-label male use mirrors 2.5 mg once to a few times weekly (NOT daily) titrated to testosterone/estradiol — a prescription drug, not an approved supplement regimen.
any
Oral letrozole 2.5 mg tablet (Femara / generic)
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)
Per cycle (days 3-7 dosing)
Weeks to months
Months to years
Months to years
2–4 weeks
4–12 weeks
4–8 weeks
8–16 weeks
Letrozole versus clomiphene for infertility in the polycystic ovary syndrome.
The New England journal of medicine (2014) · Rct · n=750
Double-blind multicenter RCT of 750 women with PCOS randomized to letrozole or clomiphene for up to five cycles, primary outcome live birth
Aromatase inhibitors (letrozole) for ovulation induction in infertile women with polycystic ovary syndrome.
Cochrane Database of Systematic Reviews (2022) · Meta analysis
Cochrane systematic review of 41 RCTs (6522 women); letrozole was used in all trials
Aromatase inhibitors (letrozole) for subfertile women with polycystic ovary syndrome.
Cochrane Database of Systematic Reviews (2018) · Meta analysis
Earlier Cochrane systematic review including 42 RCTs (7935 women); letrozole was used in all studies
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 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.
Spearmint has a higher evidence score (6.2/10 vs 5/10) and wins in 3 of 3 categories.
No known interactions between Letrozole and Spearmint have been documented in our database. However, always consult a healthcare provider before combining supplements.