I've tried the tetrasil and it had no effect. It is also very greasy so you can't use it on your scalp unless you apply it at night and then wash your hair in the morning. Also leaves grease marks on pillow case! I made a scalp spray, that is water based, all natural, and I'm looking for people to try it to see if it works. After a year of folluculitis, mine cleared in two weeks using it. If you want me to send you a free bottle, please email me.