Wow. Well I'm not gonna say its impossible, but I am very prone to gyno and have never had any issues from Tbol. Any soreness or lumps is a VERY good reason to add some Nolva, better to be safe. I did read a study about Tbol that mentioned how it out displaces natural test at the receptors...and thereby causes an INCREASE in free test levels. I would assume that this only happens at the biggining of the cycle...before natty test gets very suppressed. Thats the only way I could see Tbol causing any gyno symptoms. I suspect thats why many notice an increase in libido on Tbol too...