Very true , i wont lie , i have kind of messed around alot with my AI's on cycles , but in time u will notice especially in higher doses , u may not be prone to gyno , but wait until u wake up after hours of sleep and still feel tired and drained to hell . There is alot more going on then just the surface to worry about . High estrogen may not cause u gyno , but it has a list of other nasty sides . Ive experienced this first hand . You should always run an Ai to keep things in check