I am using the 4th bottle of treatment and very satisfied with it. So I ordered a bottle of the shampoo, which is also good, the foam is rich and cleanse well. The shampoo I had been using before made my scalp itch, but this shampoo doesn't itches me!!!!!!! Personally, I like the scent of the shampoo better. It's subtle and not overdone. But why is it so cheap? Cheap, but so good? How come???