Kérastase Resistance Sérum Extentioniste Scalp & Hair Serum 50ml consists of a scalp serum treatment for people who want to boost their hair growth. In addition, this Resistance Extentioniste range is special to give a healthy growth boost to hair without split ends, probability of breakage, and without damaged hair. Furthermore, this serum stimulates the hair root, and, combined with a gentle massage, it ends up being more nourished, healthy, and strengthened. In this sense, hair massage becomes extremely important to activate the microcirculation of hair follicles. In turn, together with the formula of this serum, these follicles become stronger and tend to grow faster.