Noriben is pack with umami. Seaweed is a very rare ingredient that contains all three typical umami ingredients, glutamic acid, inosinic acid, and guanylic acid. In addition, the rice and soy sauce used for nori valves are full of glutamic acid, and the bonito flakes are inosinic acid. Combining these ingredients enhances the umami, and according to one study, the umami is about eight times higher.