Nattokinase NSK-SD® is a natural health food that can be taken to support the cardiovascular system. Nattokinase® is an enzyme that is extracted from the traditional Japanese soy food called "natto". Nattokinase was first discovered by Dr. Hiroyoki Sumi, M.D., Ph.D. Modern research has revealed that nattokinase works by breaking down fibrin, a protein involved in clotting of the blood. Not all Nattokinase® is created equal - look for the amount of fibrin units, or FU on the label. Pure Prescriptions' Nattokinase NSK-SD® contains over 20,000 fibrin units per gram, which is more than 200% the effectiveness of other nattokinase products.
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