L'Oreal Professionnel Serioxyl Thickening And Detangling Conditioner suitable for men and women who have very fine or thinning hair, or suffer from hair loss. Hypoallergenic formula is 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.