Here is the likely lowdown on what you read. Trenbolone binds directly to the progesterone receptor. Nolva blocks the estrogen receptor. Arimidex prevents test(and derivities) from aromatizing into estrogen. Now, gyno can be caused by many things, estrogen, progesterone, IGF-1, prolactine and even simple variences in the bodies hormones. There is talk by some that in order to get gyno, you need multiple ingredients, like PR, ER and IGF-1 and the elimination of one element will reduce or eliminate chances of gyno. In the case of tren, which binds to the PR receptor, nolva would be used to reduce the IGF-1 levels (approx 56%) and hence remove an element of the recipie for gyno. This is just a theory as far as I know and does not have any medical proof and very little real world use to back it up. As for your question regarding arimidex, it only reduces IGF-1 levels by approx 18% and the decrease is likely simply due to reduced estrogen levels since estorgen is a feedback mechanism for IGF-1 release. So, arimidex would likely not give the same results as nolva.
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