Using John Freida Shampoo for Blondes?

I have naturally light brown hair with lots of blonde going through it. About two years ago I dyed my hair a reddish almost burgundy color. It soon faded to an auburn and slowly just adjusted to the color it has become now. My hair already had some hints of red in it, and now my "natural" hair is an auburn color with very little hints of blond in it.

I'd really like to bring out the natural blond in my hair. I was wondering if I used the John Freida shampoo for blondes, if it would do a good job of bringing out the subtle natural blonde in my hair or not, and how it would affect the rest of my hair.

By Rene