BIOLAGE ADVANCED KERATINDOSE: Formulated with Pro-Keratin + Silk, it provides targeted reinforcement and moisture balance to over processed hair. BIOLAGE ADVANCED Pro-Keratin Renewal Spray is a leave-in lotion that provides instant silkiness, shine and manageability. Hair is protected and frizz and flyaways are tamed. For best results use in conjunction with the KERATINDOSE System.