Salon-crafted with our exclusive PROTEINFUSION blend with Elastin Protein and Quinoa, Nexxus Color Assure Cleansing Hair Conditioner for colored hair, is a color safe conditioner that can be an alternative to your regular shampoo and conditioner regimen. This no lather cleansing conditioner sulfate free formula cleanses and moisturizes color treated hair in a single-step, extending color vibrancy for longer. This cleansing conditioner for color-treated hair is clinically proven visible color vibrancy after one use. The Nexxus Color Assure Long Lasting Vibrancy System for Color Treated Hair, with Elastin Protein and Quinoa, keep your color vibrant. Colored hair can lose its vibrancy over time, but repeating the hair color process is not the answer. After using Proteomics studies to examine hair damage at the molecular level, Nexxus scientists found that the main cause of color loss and dullness happens the moment hair is colored. Coloring hair can destroy proteins and weaken the fiber, leaving hair feeling flat and like it has lost its shine. Their scientists used an advanced scientific method called Proteomics to measure what proteins and amino acids are damaged in the hair fiber when hair is colored. The main amino acids lost during the coloring process are Cysteine, Glutamic Acid and Serine, in combination. This then allows us to design formulas to help strengthen and prevent dull hair.