When I was recently working on a film, the stylist who did my hair recommended that I check out this product, which is actually how I got to Birchbox. I mentioned it to the person who does my hair color every month and he also strongly recommended it. I now take it to the salon and have him apply it. We leave it on for about 10 minutes. Truly it is the best treatment that has ever been used on my hair. My hair is dark, curly and frizzy. I am having it flat ironed after being bleached blond and blown out straight so I need all the special conditioning I can get. This makes my hair feel smooth, strong and silky. My hair stylist explained to me that one of the reasons why it is so effective is because it is all botanicals with no fillers . This is also why it costs a bit more, but just a little bit of it goes a long way. I think I will probably get at least eight treatments out of this tube. My hair is thick and just below shoulder length.