Kerastase’s Genesis – Serum Fortifiant Hair Serum strengthens hair from root to tip while supporting the scalp to help reduce breakage and hair fall due to fragility, and its lightweight texture absorbs quickly to reinforce strands without weighing hair down. With consistent use, hair feels more resilient and looks fuller, healthier, and smoother for easier day-to-day styling.By helping fortify against daily stressors, it improves manageability and enhances natural shine while keeping the finish clean and touchable, making it a practical, targeted step for anyone focused on stronger hair and less breakage. Size:1.01oz