Promote healthy blood flow* Safely dissolve blood clots that lead to heart attack and stroke* Exert positive effects on blood pressure levels* Reduce fibrin and "sluggish blood" that can result in sore, aching muscles*Nattokinase NSK-SD™ - We tested recently introduced products and few meet the standards of Dr. Sumi, the discoverer of nattokinase, and Dr. Holsworth, the leading U.S. researcher of nattokinase. We offer only the patented NSK-SD™ formulation with no Vitamin K2, the only form that has been tested for safety. Each batch is tested to ensure potency* What is Nattokinase?* Nattokinase (nat-oh-KY-nase), an enzyme that is extracted from the fermented soy food called "natto." Natto is regarded by the Japanese as a very healthy food and has been consumed there for centuries. Nattokinase, however, has only recently been discovered, isolated and investigated. The research and anecdotal reports are very promising, suggesting that nattokinase confers several important cardiovascular health benefits*.