Featuring Nattokinase NSK-SD, Nutricology NattoZyme is isolated, purified and encapsulated nattokinase, an enzyme derived from boiled soybeans and Bacillus subtilis natto. 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. It is non-irradiated and free of vitamin K2. NSK-SD®has two Japanese and three U.S. patents. NSK-SD is produced from non-genetically modified soybeans using a selected, patented strain of Bacillus subtilis natto. Each batch is tested to ensure potency.