wait, wait, wait with that we just entered the realm of fantasy or sci-fi. Like thats just a breach of reality right there, cus its phyiscally impossible to make hair grow that dast... the output of the human bodies metabolism is not fast enough for that... no amount of cell stimulation can fix that...
Also diet pills as well... there are successfull diet pills yes but most of them have severe side effects or are considered... uhh bad... like there was this one where they basically gave you a parasite that would just suck out ones nutrients and that one worked quite alright till people found out and then no one wanted it anymore or smth...