Nexxus Colour Assure Shampoo has been specially formulated to help extend the colour vibrancy of colour-treated hair. Using Nexxus' exclusive hair care PROTEINFUSION blend, this sulfate-free shampoo cleanses colour-treated hair and helps replenish nutrients to help enhance colour vibrancy. For best use, apply shampoo to wet hair, massage into a rich lather, and rinse thoroughly. Follow with Nexxus Colour Assure Conditioner for optimal results. Nexxus scientists used Proteomics studies to examine hair damage at the molecular level and found that the main cause of colour loss and dullness is hair colouration. With this knowledge in mind, our scientists developed a one-of-a-kind PROTEINFUSION blend with Elastin Protein and Quinoa, along with other ingredients, to create Colour Assure formulas that result in long-lasting colour vibrancy — for up to 40 washes! Our Colour Assure range includes formats that create an optimal regimen for colour care. The range includes a shampoo for colour treated hair, cleansing conditioner, and a deep treatment masque. Nexxus relies on science when developing hair products that can help replenish the strength, shine, and vibrancy your hair was meant to have. We know that hair is made of almost 90% proteins, which is why we use advanced scientific methods to identify the protein needs of each hair type and create customized formulas with proteins to bring your hair back to life.