Nutricology/ Allergy Research Group, Nattokinase, 50 Mg, 300 Veg CapsProduct Description Isolated, purified and encapsulated nattokinase, an enzyme derived from boiled soybeans and a selected, strain of bacillus subtilis natto. Nattokinase nsk sd was the first nattokinase introduced, and it has established standardization and quality levels for all nattokinase, with comprehensive safety studies. It is vegetarian, non irradiated, and free of vitamin k2. Product Benefits Powerful Enzyme Derived. Dietary Supplement.