Just wanted to give a product review. I have been using Nutri-ox for a few days now, and it does seem to make the thin hair on the back of my head much fuller. It also comes with a conditioner and application spray (to be used twice daily). It leaves the head tingling. I don't think it makes the hair grow back, but I will give another update in a few weeks. I currently have hair growing back, and I am going to see if this will kick start a few stubborn spots where the hair is growing back very slowly. It is available at Sally Beauty outlets, and is not to badly priced.