Ive never had any issues when running test at between 250mgs and 750mgs ew. Its when i add tren/deca or other compounds to my cycle when i see signs of gyno, i therefore run nolva at 10mgs ed and it works well for me.. If is was running test by itself and was worried about ERSE's then get some l-dex or stan and keep it on hand, infact before starting any cycle you should have an ai on hand...