Natto sauce patent

Now, if it's too much trouble to make natto myself, I can buy natto soy sauce fermented by natto and eat it as usual, as well as the health care function of natto. I usually eat a kind of natto soy sauce, the brand is Kongshanfang, which is not bad. It is rich in nattokinase and has applied for a national patent. It tastes good. It is usually eaten as soy sauce, and it is low in salt and contains no preservatives, which is quite healthy. Everything is expensive. It is good to eat natto soy sauce. I have to eat it every day anyway, hehe