Matrix Biolage Keratindose Pro-Keratin Concentrate is a professional treatment that deeply conditions and nourishes over-processed hair.Enriched with Silk Amino Acids and a professional level of Keratin, Biolage Keratindose Pro-Keratin Concentrate restores strength and vitality to severely over-processed and damaged hair. With a highly concentrated formula, this professional treatment is free from Sulphates, Parabens, and harsh Salts and restores luscious movement and nourishment to the hair.Biolage Keratindose Pro-Keratin Concentrate leaves the hair beautifully soft, manageable, and healthy with a lustrous shine.Formulated with silk amino acids and a professional level of keratin, it penetrates into your hair to repair and reverse the signs of damage, delivering an expert blend of essential vitamins and nutrients that are vital for hair health. Directions of Use:Apply to freshly cleansed hair.Leave in for 3-5 minutes.Rinse thoroughly.