I am one of those guys who is very skeptical of anything that says it can undo what has been done. Especially when it comes to hair loss. I have heard of so many stories saying that they spend all kinds of money on a product that in the end just left them worse off than they were. That is my biggest fear going into trying a product out myself. I was reading a nisim hair review the other day that said they guaranteed their product or would give all the money back. That is the kind of product that I would be willing to try.