Okay so I am mid age and I am highly concerned with my hair lately I have the rootest clarify purifier shampoo and this is just a pre shampoo so before you shampoo your hair you leave it on for 10 to 15 minutes it has a very strong chemical smell to me also it will make your skin sensitive to the sun after using this so I would recommend looking into that but other than that I don't know if I would actually use this if you do have a skin sensitivity or a smell to because they smell of this in a bathroom is very strong to me there is a process to it it just makes me feel I don't know as if I'm damaging my hair not helping it due to the strong chemical smell of the product it is an easy application though it is a twist open bottle and just application that way **This review was collected as part of a promotion.