Enjoy fuller, thicker-looking hair with this concentrated leave-in treatment for the hair and scalp. The professional formula combines a high concentration of niacinamide with caffeine, menthol, hydrolyzed silk, silica and biotin to refresh the scalp and give a healthy shine to hair. When used with Nioxin's System 5 Shampoo & Conditioner, this volumising treatment increases the fullness of each strand and provides healthier, stronger and thicker-looking hair. Colour-safe formula.