Will using Biotin/Nioxin make my hair grow in other places as well??

I really want to grow my hair out as quickly as possible, but im nervous about taking vitamins/supplements... will they encourage hair growth in other places too?!! i dont need a hair to start growing in any strange places lol I think im going to attempt the mane n' tail shampoo... but those of you who swear by Biotin, are you sure it works?? thanks :)Will using Biotin/Nioxin make my hair grow in other places as well??
Nooo it doesn't make hair grow in any other places I use it myself and I haven't seen anything strangee

brown hair