If your hair is struggling to grow, and feeling weak and damaged, you need to try Kérastase Résistance Extentioniste Bain Shampoo. This powerful, nutrient-packed shampoo is all about rebuilding hair that’s had a rough ride, and helping it grow long and lush. It’s a must for hair that’s been weakened by heat or overprocessing. With a combo of Pro-Keratin, ceramides, and taurine, this shampoo leaves hair in a perfect position to really grow. Longer, thicker hair is on its way.