Sorry for the delay in my response. There’s very little information to go on re: testicular changes. Here are some excerpts from the few available studies:

“The follicle-stimulating hormone and luteinizing hormone levels had increased and total testosterone levels had decreased in the experimental groups compared with the control group; the differences were statistically significant. Also, the Johnsen testicular biopsy scores were significantly different statistically between the experimental groups and the control group. Although the mean seminiferous tubular diameter of the experimental groups was relatively greater than in the control group, the difference was not statistically significant. The only effects of M. piperita on testicular tissue was segmental maturation arrest in the seminiferous tubules; however, the effects of M. spicata extended from maturation arrest to diffuse germ cell aplasia in relation to the dose.”

http://www.goldjournal.net/article/S0090-4295%2804%2900418-2/abstract

“Our study suggested that spearmint probably induced oxidative stress in hypothalamus resulting in decreased synthesis of LH and FSH which in turn down-regulated the production of testicular testosterone through the disruption of a number of intermediate cascades.”

http://www.sciencedirect.com/science/article/pii/S0278691508004523

A few other studies, using another form of mint, report that:

“The present study was undertaken to assess the reversible contraceptive efficacy of methanolic extract of Mentha arvensis leaves. Aqueous solution of the extract (10 mg per day per mouse) when administered orally to male mice of proven fertility for 20, 40 and 60 days caused inhibition of fertility while maintaining their normal sexual behaviour. With the increase in treatment duration, there occurred a corresponding decrease in the mean weight of testis and accessory organs of reproduction. Sperm concentration, motility and viability in the cauda epididymis were also decreased. Spermatozoa with coiled tails also appeared in the epididymal smear. However, all the induced effects returned to normalcy within 30 days following withdrawal of 60-day treatment.”

http://www.sciencedirect.com/science/article/pii/S0378874101003646

Once again, it’s important to note that these are all preliminary studies conducted in animals. There aren’t any human studies re: mint and testicular changes that I’m aware of. Still, the data is worth considering if you’re a frequent mint user, IMO. In that case, I’d keep an eye out for any signs of unwanted effects – just to be on the safe side. If there are none, great! If you suspect something, consult with your doctor and/or take some time away from mint and see if it helps.

Be well!

JP

“Despite the beneficial effects of M. piperita and M. spicata in digestion, we should also be aware of the toxic effects when the herbs are not used in the recommended fashion or at the recommended dose.”

http://www.goldjournal.net/article/S0090-4295%2804%2900418-2/abstract

A few relevant points:

1. When conducting toxicity studies, higher than usual dosages are often employed.

2. The fact that this research was conducted in rats needs to be factored in. Men are not rats. Still, animal experiments are common starting points of research that hopes to establish the relative safety of drugs and supplements.

Nevertheless, the purpose of carrying out trials of this nature isn’t simply an exercise in futility. None of these scientists involved are concerned about rats overindulging in peppermint tea. However, they do wonder about the potential harm of chronic use and/or overindulgence in humans – be they adult men, pregnant women, etc.

IMO, the bottomline is this: It’s folly to assume an herb that is powerful enough to modulate hormones in women is not powerful enough to also cause side effects. That’s why cautious use is called for and testing is invaluable.

Be well!

JP

Why JP doesn’t mention this, except in a comment where he quotes it, I don’t know. It’s certainly not clear to the readers here.

Thanks.

Some of the animal research suggests similar activity re: peppermint. But, I don’t know of any human studies confirming or refuting this as of yet.

Be well!

JP

But then, after I tried it a second time I loved it. I’ve been drinking quite some mint tea lately so I thought I should now about some side effects. The only thing that kind of sounded familiar was the side effects on a 45 year old guy “He described it as if he felt he was suffocating, he also felt very claustrophobic.” (SnS), but then again my nose is such a mess inside I get like that without the tea sometimes.

The best information I’m aware of about mint tea is presented in the column and comment section above. To the best of my knowledge, no additional evidence has been published of late.

Please type in the word “PCOS” in the search feature on my site. You’ll find some additional information about other natural ways of addressing it.

Generally speaking, a diet that emphasizes low glycemic, whole foods that are rich in fiber and healthy fats is a good starting point, IMO. Daily exercise and stress management are also important considerations.

Be well!

JP