A test supplement could have a rather nasty effect on your prostate (specifically, make a subclinical cancer more aggressive and difficult to treat-
here's one study that suggests that, even if it is a case series). And men who take test supplements should probably be screened more often for prostate cancer. So, if you don't mind getting more digital rectal exams, hey, who am I to say?
So the real question here is why on earth would you want to take a test supplement? Are you hypogonadal?