Hollywood icons Meryl Streep, Diane Keaton and Andie MacDowell. Heartthrobs George Clooney, Pierce Brosnan and Patrick Dempsey. Add your name to the list — go gray!

There are endless hair products dedicated to concealing grays, but the best shampoos for gray hair cater to those who want to keep their gray hair—or even dye their hair to get the silver-toned ...