This Izumi Tonic Strengthening Treatment hair mask deeply nourishes, repairs, and thickens fragile hair. Formulated with rice water to strengthen and repair, izumi tonic mask leaves hair 30x stronger* and reduces split ends by up to 91%*. It features a rich formula to deeply hydrate and thicken hair, restoring key nutrients and repairing damage from brushing. Use 1-2 times per week in place of conditioner to intensely nourish and strengthen hair. Inspired by a japanese haircare tradition, the izumi tonic range is formulated with rice water, known to restore damage, prevent future breakage, and reveal healthier & smoother hair. SHU UEMURA source their rice water from hyogo, japan in an eco-friendly manner.