ya....it is the prefered ai....you can run it from the start or you can run it when you notice signs of gyno. Start it at 12.5mg ed and if that doesnt keep the gyno down then titrate it to 18.75 and then 25 if needed....also run it all the way through your pct ...remeber...if you get gyno aromasin only haults production and wont take it away. Most likely though it will go away after your pct