Spearmint tea (for PCOS)

Spearmint tea is an herbal infusion made from the leaves of Mentha spicata. It has a long history of folk use for menstrual complaints and is now studied for its mild anti-androgenic effects in PCOS, particularly for hirsutism (unwanted hair growth in male-pattern areas).

The trial evidence is small but reasonably consistent. Spearmint is a complementary intervention with a modest signal, not a primary treatment.

Consult a provider before starting supplements, especially if pregnant, breastfeeding, or on medications.

What the evidence says

Two small randomized trials (Akdogan 2007 and Grant 2010) are the most commonly cited evidence:

  • Akdogan 2007 (Turkey, 21 women with hirsutism). Two cups of spearmint tea daily for 5 days lowered free testosterone and raised LH and FSH compared to baseline.
  • Grant 2010 (UK, 42 women with PCOS-associated hirsutism). Two cups of spearmint tea daily for 30 days significantly reduced free and total testosterone and improved subjective hirsutism, though objective hirsutism scores did not improve significantly in 30 days.

Other small studies and animal work suggest mild anti-androgenic and possibly anti-inflammatory effects. A 2024 narrative review concluded the data is suggestive but limited by small trial sizes and short durations.

What the evidence does not support:

  • Spearmint as a primary treatment for PCOS metabolic features (insulin resistance, weight, ovulation). Inositol and lifestyle interventions are the more relevant levers there.
  • Spearmint as a quick fix for hirsutism. Hair follicle cycles take months; visible reduction in unwanted hair takes time even with effective treatments.
  • Spearmint as a replacement for spironolactone, OCPs, or laser hair removal for users who need effective hirsutism management.

Why it might work

The proposed mechanism is mild inhibition of testosterone biosynthesis or activity, possibly through:

  • Direct effect on androgen-producing tissues.
  • Altered androgen metabolism or clearance.
  • Modulation of HPO axis signaling (the LH/FSH changes in Akdogan are consistent with this).

The compounds involved are not fully characterized; spearmint contains many bioactive constituents (carvone, limonene, rosmarinic acid, flavonoids).

Dosing

The studied dose: two cups of brewed spearmint tea per day, with each cup made from 1 to 2 teaspoons of dried spearmint or one tea bag, steeped for 5 to 10 minutes.

Practical notes:

  1. Loose leaf or tea bag both work. Quality matters more than form; look for unblended pure spearmint, not "spearmint flavored" tea.
  2. Continuous daily intake. Effects build over months. Trials of 30 days showed hormonal changes but limited visible hirsutism change in that timeframe.
  3. Standardized extracts are also available but have less direct trial support than the brewed tea preparation.

Where to get it. Look for pure organic spearmint tea (Amazon). Avoid blends labeled "spearmint flavored" or with added herbs; the trial preparations used pure spearmint leaf.

Common side effects and cautions

Spearmint tea is generally well tolerated:

  • Heartburn or reflux in users prone to it (mint relaxes the lower esophageal sphincter).
  • Drug interactions are mostly theoretical; mild interactions with certain medications metabolized by CYP enzymes are possible.
  • Pregnancy. Avoid medicinal-quantity spearmint tea in pregnancy due to limited safety data and the anti-androgenic effect. Occasional culinary use is fine.
  • Estrogen-sensitive conditions. Discuss with a provider; the literature is mixed.

Peppermint tea is a different species (Mentha piperita) and does not have the same trial evidence. Use spearmint specifically.

Where it fits

Spearmint is a reasonable add-on for users with PCOS and hirsutism who are looking for a low-risk complementary intervention while pursuing the primary management (lifestyle, inositol, and where appropriate, medical treatments like OCPs or spironolactone).

The realistic expectation: modest. Spearmint may slightly lower androgens, may modestly support hirsutism over months, and adds a small daily ritual that some users value. It is not a transformative intervention.

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