I had the Peter Keratin Complex done by a professional stylist in my Salon two months ago. I was told that the treatment was safe on blonde highlighted hair. My hair is long and has been highlighted for over ten years with no problems. My hair has been damaged by either the complex or the flat iron process. My hair began breaking all over after the first week and continues till today. I have begun to be afraid to comb it. I have read on line that some salons are refusing to do the process a second time on their clients. I am very disappointed and am putting this out there for others who have highlighted hair.