“…Natto is made by fermenting seeds with a bacterium, Bacillus subtilis (natto) (Kimijima et al, 2022), which contains various active substances, such as vitamin K2 and nattokinase, and has health care functions, such as preventing cardiovascular disease and lowering blood pressure (Syahbanu et al, 2020;Lee et al, 2015;Zhou et al, 2020;Zhang et al, 2021;Nagata et al, 2017;Nozue et al, 2017). Approximately 60% of carbohydrates are insoluble, and 40% are soluble sugars in soybean.…”