Kerastase Genesis Bain Nutri-Fortifiant is considered the best shampoo for damaged hair. It is designed to strengthen and reconstruct individual hair strands to add resiliency and reduce the risk of future breakage. This invigorating shampoo is infused with gentle anti-inflammatory cleansers to remove impurities on the scalp and promote the growth of healthy hair. It locks in moisture to leave you with softer healthier hair.