If using aromasin start at 12.5mg ED one week before frontload. Now the first 3-4 weeks you are introducing a good amount of AAS to your system so your estrogen level is going to increase a great deal . Because of Aromasin half life start a week ahead of FRONTLOAD to be safe. You may have to increase your aromasin during the first 4 weeks. My orginal AI protocol of EOD or M,W,F is for letro or Arimidex at .5mg .