Nattokinase, an enzyme sourced from "natto," a customary fermented soy product well-liked in Japan, is generated through the fermentation of non-GMO soybeans with beneficial Bacillus subtilis bacteria during natto production. Doctor's Best Nattokinase offers the nattokinase enzyme while excluding Vitamin K2. Research indicates that nattokinase can promote the well-being of the circulatory system by contributing to the maintenance of standard fibrinogen levels in the blood.