Two cups of spearmint tea per day, made from roughly 5 grams of dried spearmint leaf total, is the dosage used in clinical trials that successfully lowered testosterone. That works out to about three or four standard tea bags split across two servings. In the most cited study, women with PCOS who followed this routine for 30 days had significantly lower free and total testosterone levels compared to a placebo group.
What the Clinical Trials Used
The key human trial was a randomized controlled study of 42 women with polycystic ovary syndrome. Participants drank one cup of spearmint tea twice daily for 30 days. By the end of the month, both free testosterone and total testosterone dropped significantly. At the same time, levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) increased, which reflects a shift in the hormonal signals that drive testosterone production.
Cleveland Clinic notes that most studies used about 5 grams of dried spearmint leaf per day, the equivalent of three or four standard tea bags. If you’re using loose-leaf spearmint, that’s roughly two teaspoons per cup, steeped twice a day. Earlier Turkish studies documented anti-androgenic effects in as few as five days, though a full 30-day course produced more robust hormonal changes.
How Spearmint Lowers Testosterone
Spearmint appears to work at multiple points in the testosterone production chain. Its compounds reduce the activity of key enzymes involved in making testosterone, essentially slowing down the biochemical assembly line that converts cholesterol into androgens. It also affects signaling from the brain: the hormones LH and FSH, which tell the body how much testosterone to produce, shift in ways that dial down androgen output.
This is a genuinely anti-androgenic effect, not just a subtle nutritional nudge. The mechanism involves decreased expression of several steroidogenic enzymes and related proteins, including androgen receptors themselves. That’s why spearmint has drawn attention as a natural option for conditions driven by excess androgens, like PCOS-related hirsutism and hormonal acne.
How Long Before You Notice Results
Hormone levels can shift within 30 days, but visible changes to symptoms like unwanted hair growth or acne take longer. In the 30-day clinical trial, women reported feeling like their facial hair had improved, but objective measurements of hair growth didn’t reach statistical significance in that timeframe. The researchers attributed this to biology: hair follicles have their own growth cycle, and it takes time for reduced testosterone to translate into thinner or slower-growing hair.
Most practitioners suggest drinking spearmint tea consistently for at least six weeks to three months before expecting noticeable improvements in hair growth or acne. One case report documented a woman who drank spearmint tea for six months and estimated her nodulocystic acne had decreased by about 50% in both size and number of lesions. The takeaway: the hormonal shift happens relatively fast, but the cosmetic payoff requires patience.
Spearmint vs. Peppermint
If you’re standing in the tea aisle wondering whether peppermint works the same way, the answer is: partially, but spearmint is stronger. Both belong to the mint family, and rat studies show peppermint also reduces testosterone and raises LH and FSH. However, spearmint produced more pronounced effects on reproductive tissue, ranging from maturation arrest to widespread germ cell loss at higher doses. The human clinical trials specifically used spearmint (Mentha spicata), so that’s the variety with the most reliable evidence behind it. Make sure your tea is labeled spearmint, not peppermint or generic “mint.”
How to Brew It for Maximum Effect
Use water heated to about 200°F, which is just below a full rolling boil. Steep for 3 to 5 minutes. Longer steeping extracts more of the volatile oils responsible for the anti-androgenic effect, but going much beyond 5 minutes tends to make the tea bitter without a clear benefit. If you’re using tea bags, one to two bags per cup is typical. For loose leaf, aim for about 2.5 grams (roughly one heaping teaspoon) per serving, twice daily.
Consistency matters more than any single cup being perfectly brewed. The clinical results came from daily use over weeks, not occasional sipping.
Safety and Side Effects
At the two-cups-per-day dosage, spearmint tea is generally well tolerated. The 30-day trial reported no significant adverse effects among participants. However, higher doses carry real risks. Animal studies have documented histopathological changes in liver and kidney tissue at elevated doses, and contact allergic reactions to spearmint leaves have been reported in rare cases.
For men, the testosterone-lowering effect is worth knowing about. Daily consumption of four cups of spearmint tea has been associated with reduced libido, and high-dose animal studies show adverse effects on testicular tissue and male fertility. If you’re a man drinking spearmint tea casually, two cups a day is unlikely to cause problems, but routinely exceeding that amount could have unintended hormonal consequences.
Women who are pregnant or trying to conceive should be cautious, since shifting LH and FSH levels can affect ovulation. Anyone taking anti-androgen medications or hormonal birth control should be aware that spearmint could amplify those effects.
What a Realistic Routine Looks Like
Based on the available evidence, a practical approach is straightforward: one cup of spearmint tea in the morning and one in the evening, each made with one to two tea bags or about 2.5 grams of loose leaf, steeped for 3 to 5 minutes. Expect measurable hormonal changes within a month and visible symptom improvement in the range of six weeks to three months. Track your symptoms so you have something concrete to evaluate rather than relying on day-to-day impressions.
Spearmint tea is not a replacement for medical treatment of PCOS or other androgen-driven conditions, but the evidence for its anti-androgenic properties is legitimate and specific. The dosage is modest, the routine is simple, and the 30-day trial data shows a clear hormonal effect at just two cups per day.