Nioxin System 4 Scalp Revitaliser is a moisturising, lightweight conditioner for fine hair that is chemically coloured. Thinning level: noticeably thinning. Nioxin System 4 is scientifically created to leave the scalp feeling refreshed, and to give protection from the sun and damaging environmental elements. Hair colour is protected against fading. The hair is visibly thickened, healthy fullness is regained.