SERIOXYL, DENSIFIER TREATMENT FOR NATURAL HAIR The Serioxyl range from Lóréal Professionnel is renewed to help you strengthen your hair. This new range has a hypoallergenic formula, ideal for the sensitive scalp. The shampoo for natural hair cleans the scalp of impurities while bodifying the hair fiber to give a densifying appearance. In addition, this clarifying and densifying shampoo is designed for fine and natural hair.