"I have sensitive skin and an allergy to a certain ingredient that exists in most shampoos. I first bought this product in Greece, simply because I ran out of my other shampoo (the only one I could use at the time). I've had no reactions to this whatsoever, and it's SO much better for my hair than the other stuff. It leaves my hair soft and shiny. Even my hair stylist noticed the difference when I switched over to this."