Science-Based Nutrition Dietary Supplement Enzymatic Support to Help Maintain Healthy Cardiovascular Function 720,000 Lumbrokinase Units Per Serving Doctor's Best Lumbrokinase is a group of highly stable fibrinolytic enzymes that have been studied and utilized extensively in China for many years. Research suggests that lumbrokinase may have beneficial effects on the cardiovascular system. Lumbrokinase is a highly active form of this enzyme group and may be used to support and maintain healthy cardiovascular function.