Redken calls this the brand's most concentrated hair repair system, noting that it's specially formulated for color-treated, ...

It provides a subtle touch of color, while adding shine and conditioning to all types of hair. “It’s fully customizable, so anybody and everybody can get it,” Oster said.

“The Redken Color Extend Graydiant Purple Shampoo is excellent for those with gray hair,” Andrew Fitzimons, LA-based celebrity hairstylist — working with Kim Kardashian, Khloe Kardashian ...