If youre prone to gyno then use an AI. I would suggest arimidex at .5-1 mg per day because it limits your estrogen to about 50-70% of what it would be (estemated because I dont have the actual info infront of me right now to double check lol, but its around there). This leaves enough estrogen to still get your dick up and repair your tendons and ligements. I wouldnt do it unless you know you need it though. Ya nolva is best for PCT with other drugs. Dosages range between 10mg and 40mg ed, 20 is usualy the magic dose for most guys though.