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Source Naturals NSK-SD™ Nattokinase Description Whole Body Systemic Enzyme for Healthy Circulation Nattokinase is a systemic enzyme isolated from the traditional Japanese soy food, natto. It has been shown to support healthy blood flow by assisting in the circulatory clearing system of the body. Directions 1 capsule three times daily on an empty stomach with 8 ounces of water, Free Of Yeast, dairy, egg, gluten, wheat, sugar, salt, preservatives, artificial flavor and fragrance. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.