Hi everyone,   I am 26 year-old Caucasian male, and have really, really fine, dead-straight, dark brown hair with some slight thinning in the temples (which thankfully seems to have stabilized).   Over the past four to five years, I've found that my hair has become very dry and brittle and responds poorly to any sort of high-street shampoo or conditioner. Obviously I have always had fine hair, but prior to the age of 21 I was able to wear it long, wash it...