Strengthen and thicken hair fibres with the kerastase initialiste advanced scalp and hair concentrate a leave in hair treatment that will revitalise the look of your locks the scalp and hair concentrate uses plant based biotechnology to keep hair looking healthy and shiny enriched with malcus domestica plant cells the treatment will thicken the hair fibres to leave hair more resilient to breakage by 93 after use the quality of your hair will be improved and hair will feel stronger look