Izumi - Japanese fountain - Tonic is inspired by the Japanese hair beauty tradition yu-su-ru, which consists of soaking hair in rice water. This light and transparent formula, used in the Izumi Tonic range, strengthens and gives density to the hair. The result: hair up to 16 times stronger, thicker, protected from breakage, and split ends reduced by up to 81%. Hair is left soft, smooth and full of shine. Benefits Hair is instantly up to 16x stronger. After 28 days, hair is more beautiful: smoother, silkier, shinier, and healthier looking. How to apply After cleansing with Izumi Tonic shampoo, apply to clean, damp hair on lengths and ends, leave on for 5 minutes and rinse. Finish with Izumi Tonic serum.