Fibrin Unit (FU)
Fibrin Unit (FU) : A unit of potency for nattokinase, an enzyme that reduces the viscosity of blood and reduces its tendency to clot. The enzyme was discovered in natto, a traditional cheese-like Japanese food made from a fermented soybean mash. The unit is defined in terms of a specific test of a preparation's ability to dissolve fibrin, the protein found in clots; there is no standard equivalence to millograms
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