Super serum from L\'Oréal Professionnel Serioxyl Thicker Hair is an everyday hair thickening serum for lengths that leaves hair fibre looking thicker.* Enriched with Intra-Cylane™ to notice an immediate improvement to the thickness of hair. Intra-Cyclane is a thickening molecule born of ten years\' research to reveal hair that looks thicker and appears fuller to the touch. *Instrumental test Thicker Hair versus classive shampoo.With over 10 years of research, L\'Oreal Professionnel\'s Serioxyl range re-densifies the look and feel of fine and thinning hair with targeted haircare and serums.