i'm 15 and female, for maybe 2 years or more my hair has been falling out, it is very thin now, and it doesn't grow past my shoulders. I went to the doctor to go and see what was wrong, I heard that thyroid disease? could make your hair fall out but I got checked for that and I don't have it. The doctor said it doesn't fall out from the root but about an inch away from it or so and that it is brittle. He told me to take vitamin B supplements, but they don't work. I also tried a shampoo and conditioner called Nioxin, I think it was called, it's supposed to make your hair healthier, but it didn't work. =/ Now I just use Brilliant Brunette shampoo and conditioner. I even stopped straightening my hair. Does anyone know what will work?