Isolated from a traditional Japanese food, Naturally Vitamins Nattokinase is a powerful tool for protecting your heart. Natto, a soy-based cheese, is the sole source of the enzyme, Nattokinase. It's even been credited with being the cause for Japan's record setting low incidence of heart disease. For those who avoid pharmaceuticals and prescriptions, it's valued as a blood thinner and for breaking up clots.The tablet that delivers the nattokinase enzyme is specially coated so that it passes through your stomach undigested to be absorbed more directly by the blood stream through the intestine. The power of natto is combined with a bioflavonoid called Rutin, which also supports heart health. Rutin also helps thin blood, improves overall circulation and lessens the negative effects of bad cholesterol. Naturally Vitamins Nattokinase: powerful, natural support for your heart.