Tren can cause gyno but not by aromtizing into estrogen but rather prolactic. So it is prolactic gyno not progestrigen. Thus, there is little that Nolvadex can do to help.
You can try taking Solaray Vitex 400mg tabs twice daily (this is an herb that you can buy at gnc) I've heard that this has helped some people. I personaly do not know. I am not pron to progesterine or prolactic gyno.
Another treatment that some people have good results with is Bromocriptine taken @1.25mg twice daily. AM/PM
Bromocriptine is a dopamine receptor agonist, which can help stop prolactin production. However, Bromo has side-effects which make it impractical for many people. http://www.rxlist.com/cgi/generic3/bromocriptine_ad.htm
There isn't much that can be done to fight prolactin gyno, but some good news is that people have found that while taking vitex and Bromo there symptoms reduced and for some even disappeared all together...However, some people I know have tried Vitex and Bromo and it did nothing for them.
If you want something for sure..you may try and get your hands on some RU486 (the morning after drug) this is the only drug proven to stop prolactin Gyno.
Everything I've read seems to say that estrogen is the linchpin. Without estrogen no breast growth occurs . Max Rep posted a really good article (I believe it was MR that posted it, it could have been Hulk) on the old board. It shows that by taking a dosage of Arimidex (which helps raise IGF-1 levels) that prolactin and progesterine gyno were eliminated. Without Estrogen there can be no Gyno. So if one is prone to Prolactin Gyno, It would be advisable to use Arimidex ED through out the cycle.
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I probably need to spend more time in The anabolic forum..it's been awhile since I did any AAS related research... And I can't remember the last time I went through my old archives.