This product with vitamin H and silk protein intensely moisturizes dry, rough hair. For hair that feels soft and smooth. Based on lab test with TreSemme Smooth & Shine Shampoo & Conditioner vs. non conditioning Shampoo. HOW IT WORKS Delivers intense moisturisation, targeting the areas your hair needs it most - the key to salon silk moisture. Contains silk protein and vitamin H. For smoother, silkier hair.