A straight look at the testosterone question, the safe amount to drink, and where the evidence stops.
- The testosterone-lowering research on spearmint is real, but it was done in women with PCOS, not men. Two cups a day for 30 days dropped free and total testosterone 20 to 30 percent in those trials.
- There is no equivalent human trial in men. The concern for men comes from rat studies and extrapolation, not direct evidence.
- Occasional or moderate drinking is not the issue. The anti-androgen signal only showed up with consistent daily intake over weeks.
- One to two cups a day is the studied range. If you are actively trying to raise or protect testosterone, sustained high daily intake is the open question, so keep it casual or pick another herb.
Does spearmint tea lower testosterone in men?
This is the question that sends most men to this page, so here is the honest answer first: we do not have a single human trial that measured what daily spearmint tea does to testosterone in men. Everything you have read that says it "lowers testosterone" traces back to two places, and neither one is a men's study.
The first is a small set of trials in women with polycystic ovary syndrome, where lowering androgens is the goal. The second is a handful of rat studies. Both are worth understanding, because they tell you where the real caution lies and where the internet has overshot the evidence.
What the studies actually found
There are two human randomized controlled trials on spearmint and androgens. Both enrolled women with excess hair growth driven by high androgens, and both used the tea as a treatment, not a risk.
In the larger trial, 42 women drank two cups of spearmint tea a day for 30 days. Free and total testosterone fell significantly compared with a placebo tea, and the hormones that signal the body to make testosterone, LH and FSH, rose. An earlier five-day study in 21 women showed the same direction of effect in a shorter window.
So the effect is genuine, and it is measurable. The catch is that it was found in a group chosen because a drop in testosterone helps them, dosed deliberately, and tracked over weeks. None of that maps cleanly onto a man drinking the occasional cup of mint tea.
What about men specifically?
Here the evidence thins out fast. Rat studies have shown that spearmint, at concentrated doses over weeks, can reduce testosterone and affect testicular tissue in a dose-dependent way. One 45-day study feeding male rats spearmint extract found the changes it measured were not statistically significant at the doses used, and concluded there was no significant toxic effect on fertility at those levels, while noting high doses could be a different story.
You will also see a widely repeated line that "four cups a day can diminish libido in men." That claim circulates through review papers rather than a dedicated men's trial, so treat it as a plausible caution that has not been directly tested in men, not a settled fact.
How much spearmint tea is safe?
Across the research, the dose that produced hormonal effects was one to two cups a day, consumed consistently for at least a few weeks. That is also the amount most often suggested when spearmint is used on purpose for its anti-androgen effect. For a man who simply enjoys the flavor, that gives you a useful line to stay under.
| Daily amount | What the evidence suggests for men |
|---|---|
| Occasional cup | No reason for concern. Well below any studied effect level. |
| 1 cup most days | Low concern. This is at the bottom of the range that showed effects in women dosed on purpose. |
| 2+ cups every day, sustained | This is the intake that lowered testosterone in the female trials. If you are protecting testosterone, this is the pattern to avoid. |
| 4+ cups every day | Beyond studied territory for men. The libido caution, though untested in men, points here. |
Worth being clear on one thing: spearmint and peppermint are not the same plant. Spearmint (Mentha spicata) is the one studied for anti-androgen effects. Peppermint has its own research and has not shown the same testosterone effect, so do not lump them together.
Other side effects worth knowing
Beyond the hormone question, spearmint tea is generally well tolerated. The effects people actually run into are mostly mild and mostly about the digestive tract:
| Effect | Notes |
|---|---|
| Acid reflux / heartburn | Mint relaxes the lower esophageal sphincter, which can worsen reflux in people prone to it. Peppermint is the bigger culprit, but spearmint can do it too. |
| Allergic / contact reaction | Rare, but contact allergy to spearmint leaves has been reported. Stop if you notice a mouth or skin reaction. |
| Medication interactions | If you take medication that is sensitive to liver enzyme activity, mention regular herbal tea use to your doctor or pharmacist. |
| Pregnancy | High or medicinal amounts are generally advised against. This is a talk-to-your-doctor situation, not a casual-cup one. |
Who should be cautious
Most men can drink spearmint tea without a second thought. The people who should pay closer attention are men already dealing with low testosterone or fertility concerns, anyone drinking large amounts every day out of habit, and men on medications where liver enzyme activity matters. If that is you, the fix is not fear, it is moderation and a quick conversation with your doctor.
And if the reason you are drinking mint tea is simply that you want a warm, caffeine-free evening drink, there are herbal options built for men that skip the testosterone question entirely. If you want something for daytime energy instead, a men's Energy Blend gives you a lift without the mint question hanging over it.
Quick check: should you worry about your spearmint habit?
How much spearmint tea are you actually drinking?
The bottom line for men
Spearmint tea's anti-androgen effect is real, but it was found in women being treated for high androgens, at a deliberate dose, over weeks. There is no human trial showing the same thing in men, and the animal data points at high, sustained intake as the concern rather than the occasional cup. Drink it casually and there is nothing here to fear. Drink two or more cups every single day while trying to build or protect testosterone, and you are working against yourself for no good reason. Moderation settles the whole question.
FAQ
Does spearmint tea lower testosterone in men?
There is no human study measuring daily spearmint tea's effect on testosterone in men. The testosterone-lowering evidence comes from trials in women with PCOS and from rat studies. For men, occasional or moderate drinking is very unlikely to cause a hormonal problem. The realistic caution is sustained, high daily intake.
How much spearmint tea is safe to drink?
One to two cups a day is the amount used in research. For men who are not trying to lower testosterone, staying at or below a cup a day keeps you under the intake that produced hormonal effects in the studies. Occasional cups are not a concern at all.
Is spearmint the same as peppermint?
No. Spearmint (Mentha spicata) is the variety studied for anti-androgen effects. Peppermint has a different chemical profile and has not shown the same testosterone-lowering effect, so the two should not be treated as interchangeable on this question.
Will a cup of spearmint tea ruin my gains?
No. A single cup, or the occasional cup, is far below the amounts and duration that moved hormones in any study. The only pattern worth avoiding if you care about testosterone is drinking two or more cups every day, consistently, over weeks.
- Grant P. Spearmint herbal tea has significant anti-androgen effects in polycystic ovarian syndrome: a randomized controlled trial. Phytother Res. 2010. Link
- Akdogan M, et al. Effect of spearmint (Mentha spicata Labiatae) teas on androgen levels in women with hirsutism. Phytother Res. 2007. Link
- Akdogan M, et al. Effects of peppermint teas on plasma testosterone, FSH and LH levels and testicular tissue in rats. Urology. 2004. Link
- Evaluation of possible toxic effects of spearmint on the reproductive system, fertility and offspring in adult male rats. PMC. Link