Where to begin. First off this stuff does not spread well. I never noticed any difference in the thickness of my hair. I did in fact notice that it made it a ton easier to pull my hair out (not matter how gentle I was) when I was shampooing with this stuff; a lot of hair came out, which is scary! I gave up and went back to Neutrogena Shampoo and my hair stopped coming out.Side note: Well, at least the shampoo didn't smell and Jason's thin to thick Conditioner seems to work much better; although I can't tell if it has helped with the thickness part...sigh.