This stuff is great for thinning hair, but you need some hair for it to adhere to.  It's keratin, which I believe is a protein that is part of the structure of hair and it looks very natural, if you choose the right color.  Even a hairdresser couldn't tell I was using it until she washed my hair.  It comes out easily with shampoo, but can last for a day or two if you don't wash your hair.  It makes your hair look so much thicker and that is saying something.  My hair is so thin in the back that my scalp shows through, but with Toppik, you can't tell.  Even if someone was sitting behind you, like in church, I don't think they would pick up on the fact that you are using it.  Men, if your head is totally bald, you know, shiny, I don't think this is for you, but if you are thinning and still have a fair amount of strands of hair left, this could work for you.  Be sure to get the color closest to the rest of your hair.  I believe they even have grey.  I use either the dark brown or the light brown depending on the shade that I have my hair dyed.  Also, it doesn't come off on my pillow like the Joan Rivers junk, and the medium size can lasts pretty long. It's expensive, sort of, but worth it.  Definitely cheaper than a wig or toupee.  As soon as I open a new container, I order another one, just to make sure that I never run out.  The best price I have found is on this website. Sally's Beauty Supply is much more expensive, as is the Toppik website.