- Leave in intensive treatment for Color-Treated Hair. Creates thicker feeling hair while helping to protect and repair hair and help support healthy hair. Extends longevity to color. LifeXtend Complex: Hydrates and nourishes while strengthening and fortifying for thicker, fuller looking hair. Kelp Extract: Helps protect from damage. Color Keeper: Extends longevity of hair color. Apply daily to scalp and hair, do not rinse. May cause temporary redness.