My aunt is a pharmacist and she said it makes perfect sense to use mn on hair that isn't growing. She says that if there is a fungus that is causing the growth stunt, then then active ingredient, MN, stops the fungus and helps to resume growth. I tried MN and it worked wonders for me. My hair has never been past shoulder length and now it is almost bsl!!!! so i don't know if i had a fungus but all i know is the stuff works.