test causes gyno through aromatizing into estrogen so you take an AI to combat that
tren can also cause gyno even by itself... I call this "progestin gyno" and we think it may be due to increased prolactin levels and taking something like cabergoline would help. My wording is careful because we don't know for sure... In short, hormones are complicated.
What's wrong with "your friend" he cant' do his own research? if he's too lazy to type "how to run a PCT" into google and read for a few minutes then he deserves some tig ol bitties. If he's that lazy then he really shouldn't cycle. The questions asked are indicative of someone who doesn't know what they're getting into. How much of his gains is he going to keep... how the **** am I supposed to know? That's something that only he can do.
Tell your friend to get his sh1t together... Basically he'll need an AI and a SERM for sure... And he has to look them up and figure out how to use it because I don't think anyone here wants to spoon feed your lazy friend this really basic information through you.