I couldn’t tell wether this treatment was working in the first year. I suppose when you look at yourself in the mirror every day, it is hard to tell a difference. But my hair stylist could tell a huge difference. She noticed my hair was growing in faster and therefore I went in more often for my hair cuts. I also required more hair color as more hair was coming in and thicker too. She said she was using twice as much hair color to cover the gray soon into my treatment. I am very pleased with the outcome. Thank you Dr. Donaldson.