Natto polypeptide is an MJ50 strain obtained by mutating Bacillus subtilis by South Korea Zhengming Co., Ltd. with internationally advanced proprietary biotechnology. Its metabolites contain nattokinase, L arginine, angiotensin converting enzyme inhibitor, soybean isoflavone and other substances. Natto polypeptide has the functions of dissolving thrombus, reducing blood viscosity, improving blood circulation, softening and increasing vascular elasticity. It is a biological product used for non-drug treatment in Korea.