They have a money back guarantee that if you take as directed for the minimum amount of days according to your condition and are not satisfied with your level of progress you get your initial investment back. I bought 3 bottles at a cost of $427.00, had no improvement and they told me to get more and continue taking the product. I bought another 3 bottles at the same price.No improvement after 7 months on it.They gave me 90 days and after that I was supposed to receive my money back. I called them and they gave me a hard time. Would not give my money back!!!