WHO IS IT FOR: Formulated for all hair types. HOW DOES IT WORK: Serum formulated as part of a system with advanced technological innovations to help maintain the look of existing hair by minimizing the amount of hair lost each day due to breakage. This serum works with the system to promote thicker, fuller, healthier looking hair. Immediate cooling sensation refreshes the scalp. When used with the system, combats daily hair loss from breakage and helps increase the hair strand diameter for thicker, fuller-looking hair.HOW/WHEN TO USE:Shake well. Pump serum into palms 2 or 3 times; massage into the scalp and work through damp or dry hair. Do not rinse. Follow with Root Power Restorative Style Wax for immediately fuller-looking hair.