My hair dresser told me about Toppik's Hair Building Fibers because one of her clients has had success using it.  Toppik is intended to make your scalp appear as if it has hair in the right places.  This illusion is created by the tiny keratin particles bonding to your own hair.  If your scalp is actually bald and there is no hair that is combed over it, this product isn't going to work for you.  That said, it does wonders for those of us with thinning hair.  Just be sure to get the correct color that matches your own.  For example, the light blonde is strictly for those with very light, platinum blonde hair.  If your hair has the least bit of ash or red tone in it, opt for the medium blonde Toppik.