Nolva is a horrible drug. It's site specific, so it's great at preventing gyno, but gyno is easily avoided. And nolvadex has a rebound effect so it can actually cause gyno after you stop.
PLUS, it kills gains. PLUS, it causes mood swing, depression, impotence, possible eye damage, higher increase for potential stroke. People like to regard it as a "real" PCT drug but that comes from quesswork from gurus of the 90's transferred to the internet
It's liver and kidney toxic and has been shown to cause tumors. And there is no solid evidence that it does anything to restore HPTA. . It is nothing but a myth.
Why anyone would use that shit drug is beyond me.