Yeah, some of them work, at least for some people. Almost every male in my family, and all the direct-line male relatives on both sides, went bald by their late twenties. Maybe I just got some good dice rolls and so this is a tiger rock, but when I noticed my hair just beginning to thin around age 23 I got on finasteride and have been taking it ever since. I'm 36 now, full head of hair, and if anything my hair grows fast enough that it's kind of annoying how often I need a trim.