As the second step of the reconstruction system, the serum acts inside the hair fibre, providing body and substance with a filling and restorative effect. Thanks to the synergy of amino acids, vegetal keratin and vegetal collagen, it instantly regenerates brittle and damaged hair, restoring strength and elasticity. It immediately improves the resistance and body of thin hair without weighing it down or leaving it greasy; it gives intense shine, discipline and silkiness to dull and frizzy hair.