Nattokinase, 2000 FUs is a fibrinolytic enzyme derived from "natto", a traditional Japanese food. Doctor's Best Nattokinase has the vitamin K removed because vitamin K assists in blood coagulation. Nattokinase lowers plasma levels of proteins that affect blood flow. These actions of Nattokinase are similar to an endogenously produced enzyme, plasmin. Plasmin, present in blood, degrades many plasma proteins, including fibrin clots. The net effect of lowering these proteins is a modulation in overall circulation and blood flow. It is recommended to take 1 capsule daily, between meals, or as directed by a nutritionally-informed physician. Contains soy. Do not use this product if you are pregnant or nursing, are allergic to soy, or if you are taking blood-thinning medication, consult a physician before taking this product. Store in a cool dry place.