L\'Oreal Professionnel Serioxyl thickening* & detangling conditioner suitable for men and women who have very fine or thinning hair, or suffer from hair loss. Hypoallergenic formula suitable for sensitive scalps. This conditioner cares & detangles the fiber without weighing it down, whilst thickening the appearance of hair for an immediate densifying effect*. *Instrumental test Serioxyl shampoo + conditioner. 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.