Inspired by yu-su-ru, the Japanese tradition of bathing the hair in rice water, the Shu Uemura Izumi Tonic Strengthening Serum encourages stronger-looking lengths. The ultra-lightweight serum formula is enriched with rice water, nourishing the hair to promote a visibly glossy lustre and satin-soft finish. Apply to cleansed and conditioned hair to support fuller-looking tresses over time.