nolvadex is NOT and i repeat NOT an ai... it will merely suppress it and it does do a good job of that but then when you stop, then what? it can just come right back etc.. its NOT an ai.. you need aromasin or ariimidex on cycle... nolva is something you would want to use in conjunction with an ai when you are using anadrol, being its not a true estrogen converting compound yet has the sides so an ai doesn't seem to do the job on its own and you would also use it with an ai in an anti gyno protocol but you never want to solely depend on it as your ai by itself...