Serostim is the most faked/counterfeited pharm hgh if what I hear is correct.faking genos would be a motherfucker. the inserts are a fairly complicated design, the packaging is not trivial either. fakes would be easy to spot.
I couldn't find his post but I've personally never seen Geno faked. Nor is it the most faked by a long shot. Generic is faked way more.