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Nattokinase NSK-SD®

Klaire Labs



Nattokinase NSK-SD® product image

Nattokinase is a proteolytic enzyme whose principle effect is fibrinolysis or degradation of fibrin, a fibrillar protein that when linked together forms the mesh essential for blood clot formation.† Nattokinase also upregulates the body’s natural mechanism that guards against excess fibrin formation.† Nattokinase may support healthy blood clotting, circulation, and platelet function by helping to maintain optimum function of the body’s normal fibrinolytic processes.† Produced from fermentation of non-GMO soybean isolates by Bacillus subtilis natto. Standardized to fibrin activity units and free of vitamin K.

Suggested Use:

Take 1 capsule, 2 times daily, 12 hours apart, with or between meals. Use is contraindicated in persons with history of bleeding tendency.



Serving Size: 1 Capsule


Amount Per Serving

Nattokinase NSK-SD®‡ … 100mg

(supplying 2,000 FUΔ)



Other Ingredients: Microcrystalline cellulose, vegetarian capsule (hydroxypropyl methylcellulose, water), L-leucine, and silicon dioxide.

Contains: Soy.



Free of the following common allergens: milk/casein, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, and yeast. Contains no artificial colors, flavors, or preservatives.


ΔFibrinolytic units or fibrin degradation units (FU) is a measure of enzyme activity. Nattokinase NSK-SD® is standardized to contain 2,000 FU per capsule.


‡NSK-SD® is a registered trademark of Japan BioScience Laboratory, Co., Ltd.


If you are pregnant, nursing, have a medical condition, or taking prescription drugs, consult your physician before using this product.



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