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Bacillus subtilisnatto. Nattokinase NSK-SD® was the first nattokinase introduced into the US market, and it has established standardization and quality levels for all nattokinase, with comprehensive safety studies and proven potency.

NSK-SD® is standardized to be well tolerated and consistent in strength, free of vitamin K2, and backed by multiple patents and clinical research. Nattokinase NSK-SD® (soy) (2000 FU): 100 mg. Servings Per Container: 60 or 180.