I use DHT derivatives like Mesterelone 12.5-25mg/day(Provironum) and/or Drostanolone Enthanate 10-20mg/day(Masteron) for multiple beneficial effects, one of them being E2 control/inhibition. I can only tell you my subjective experience as I have no labwork done on this. We are permanent travellers and the places where we have been do not have the "right" testing facilities or methods. And even if they do, I do not know if testing/measuring would be of any good as my protocol is in a continuous state of flux. I do have a E2 rebound effect after I completely stop the DHT derivative, I get E2 symptoms like stiff hands at awakening and a slight increase in bloating and visceral fat, mentally less astute, emotionally more susceptible to kittens and romcoms, less energy/strength and motivation/aggression to workout. This will take a week or so for the body to compensate/adapt and reach homeostasis again. Because of this and the other beneficial effects (which I elaborated on in another thread) I will always keep a DHT derivative added to my protocol if possible, instead of an AI. Probably this body is not a good 5AR converter and more of an aromatiser. Again my apologies for not being scientific about this.