Science-Based Nutrition Dietary Supplement 2,000 FU"s Per Veggie Cap Suitable for VegetariansNattokinase is an enzyme derived from "natto", a traditional fermented soy food popular in Japan. During the natto production process B. subtilis natto, a friendly bacteria, ferments boiled, non-GMO soybeans, releasing nattokinase. Best Nattokinase contains pure nattokinase enzyme with all Vitamin K removed.