Kérastase Serum Extentioniste is a highly concentrated leave-in serum with active ingredients that stimulate the growth of strong and healthy hair follicles. This stimulating treatment is an important step in strengthening the roots and promoting a healthy scalp environment. Its lightweight formula uses ceramides to protect the scalp from external aggressions while stimulating the roots. An ideal way to activate the growth of healthy long hair is to apply with a light head massage. - Cleanses and protects the scalp - Rebuilds the fibers - Activates the hair follicles to grow maximally - Stimulates and promotes a healthy scalp