Well, on the one hand many of my girlfriends and myself included have used the mane'n'tail product to encourage hair growth, and though my hair did grow, I don't attribute it to this product. My hair was also very dull, lackluster if you will, and sooooo dry! At the time, when I was using it and thinking that my hair growth might have something to do with the product, I recommended it to my mother and my sister. They both got really bad rashes from it and threw it out. I haven't touched the stuff since, not to mention my hair loss drastically decreased since I stopped using it. There are other products out there that will perform much better for the same price.