Grey hair is the first visible aging. Unfortunately, hair that loses its colour also loses its quality. Thinning hair, rough and difficult to maintain. Colouring allows to hide naturally grey hair, but cannot return the lost quality of the hair fiber. To avoid hair aging, Kerastase has developed a youthful hair serum. The serum activates the youthful hair structure to compensate for the damage caused by grey hair. Through a composition of antioxidants and Stemoxydine. Densifique Serum Jeunesse acts against the thinning of the hair fiber, against the reduction of the melanin content and to slow down the depigmentation of the hair.