Nattokinase is a systemic enzyme isolated from the traditional Japanese soy food natto. Source Naturals uses high grade 'NSK-SD' brand Nattokinase. It has been shown to support healthy blood flow by assisting in the circulatory clearing system of the body.
Nattokinase (NSK-SD?) providing 2,000 fibrin units (FU) of activity Other Ingredients: Soybean Oil, Gelatin, Glycerin, Beeswax, Glycerin Fatty Acid Ester, Lecithin.