I'm sitting here wondering if a guy runs nolva for like 6 months lets say theoretically, will his test production stay high that whole time or will it lose its effect after a while. I've read that with cyclophenil after about 5 weeks your body figures it out and shuts your test production down hard but i think nolva works differently. So which anti-estrogens and aromatase inhibitors can a guy run for however long with test levels staying high and which ones are only effective for a certain amount of time?