This is a life saver - I could not live without it.  I have a full head of hair, but there's one spot on the top of my head that is thinning out and I'm very self concious, so instead of going through a transplant, this does the job.  A friend of mine that had the same problem but she has her hair with highlights, uses it as well, and she has 2 bottles, one in light medium brown and another blonde, and she uses both at the same time.  It looks great