it all depends on your dose. Usually TRT doses avg around 200mg's every 7-10 days, which is considered a low dose of exogeneous test use. With that being the case, many do not even need an ai or serms with such a small dose. I do believe that with TRT regemines proviron is a very good compound to use at 50mg's a day and Nolva works just fine if you have any signs of gyno, as there is no reason to use a stronger compound like an AI for low dose test(TRT). Now everyone is genetically different and I personally do not get gyno at all with TRT doses, but have used proviron(for muscle hardness and libido) and nolva has worked fine for me when I use a mid range dose of test, like 400mg's a week.