Color-treated hair can fade and lose it's luster over time. Inspired by nature's fade-defying orchid, Biolage Colorlast Shampoo helps maintain the color depth, tone and shine for vivid color-treated hair. Give her hair salon-vibrant color for up to 9 weeks. When using the system of Colorlast Shampoo and Conditioner vs. a non-conditioning shampoo. Low pH shampoo for color-treated hair helps prolong color vibrancy. Gently cleanses to prevent unnecessary stripping of color. Paraben-free formula is suitable for color-treated hair.