Kérastase Premiére Bain Décalcifiant Réparateur shampoo gently cleanses the scalp while effectively removing calcium build-up from the hair, which contributes to brittleness and loss of elasticity. Damaged hair is more susceptible to absorbing minerals from water due to its higher porosity, which disrupts its structure and makes it dull and unmanageable. With 8% organic citric acid, the shampoo effectively releases calcium from the surface and inside the hair, while the amino acid glycine helps restore keratin bonds and strengthens the hair from the inside. The result is smoother, stronger and visibly healthier hair fiber. Its rich, creamy texture transforms into a fine foam with a pleasant scent of citrus, jasmine and woody notes.