Everyone is different in their response to each AI and everyone is different in their response to test. So part of this is going to be dependent on YOUR body. Start with .75mg EOD and then adjust from there. If you need more, go to 1.25mg EOD. I find that letro is good but tends to dry people out a little more easily than adex. IME, both are better than Arom though. Remember that with Test U will take time to build up, so what works in wk 3 may not be enough in wk 6. Also, once you start the Prov, you may be able to get away from less letro.