Science-Based Nutrition™Helps Support Cardiovascular and Circulatory HealthDietary SupplementVegan / Non-GMO / Gluten FreeNattokinase is an enzyme derived from "natto," a traditional fermented soy food popular in Japan. During the natto production process, non-GMO soybeans are boiled and fermented with friendly Bacillus subtilis bacteria producing nattokinase. Doctor's Best Nattokinase contains nattokinase enzyme with Vitamin K2 removed. Nattokinase has been shown to support a healthy circulatory system by helping to maintain normal fibrinogen levels in blood.Helps support a healthy circulatory system.