Est. 1973 Enteric Coated Digestive Enzymes Cardiovascular Support Dietary Supplement Lab Verified A Brighter Way Since 1973, we've scoured the globe for the highest quality ingredients, connecting you with the most efficacious supplements that help you live brighter and embrace the moments that matter most. Nattokinase is intended to provide nutritive support for normal, healthy blood flow and circulation. Nattokinase is a fibrinolytic enzyme extracted from the traditional Japanese food natto. Solaray Nattokinase is enteric coated, which helps the capsules survive the stomach acid and pass into the small intestine. Nattokinase is generally stable in a pH range of 6.0 to 12.0, ideal for absorption in the small intestine.