L'Oréal Paris Elvive Full Resist Shampoo is a reinforcing shampoo for weak and fragile hair designed to reduce breakage and strengthen hair from root to tip. It is formulated with a blend of ingredients including biotin, vitamin B5, and arginine, and is also available with Aminexil to help resist hair fall. The shampoo aims to make hair less prone to breaking, feeling healthier, and more reinforced over time.