This thickening serum hydrates and strengthens fragile hair. Formulated with rice water to repair and fortify, Izumi Tonic Serum leaves hair 30x stronger* and reduces split ends by up to 91%*. Powered by ceramides, this leave-in treatment thickens and increases hair diameter, ideal for boosting volume. Apply after styling to add texture, thickness, shine, and hold.

Inspired by traditional Japanese haircare, the Izumi Tonic range uses rice water to repair damage, prevent breakage, and reveal smoother, healthier hair. The rice water is sustainably sourced from Hyogo, Japan.