This product contains serine protease, which is produced by Bacillus subtilis during the fermentation process of natto.The Bacillus subtilis thrombolytic enzyme is an advanced line of research building upon nattokinase. This invention was led by Professor Yang Ruijin and his team at the School of Food Science, Jiangnan University. Through extensive experimental work, the team optimized the fermentation process, separation and purification methods, formulation techniques, and large-scale producti