Does john freda sheer blonde shampoo work if you dont have highlights and will it make your hair go blonder ?

im 12 and my hair used to be really blonde but now its darker than a dirty blonde colour





ive never got highights before !Does john freda sheer blonde shampoo work if you dont have highlights and will it make your hair go blonder ?
It doesn't have coloring in it, so it won't make your hair blonder. What it does is it takes the brassiness out of blonde hair. Brassiness makes blonde hair dull.