I’ve been taking and making natto for years, wonderful stuff. I take mine with red yeast rice. Unfortunately, most of it comes from China and is out of stock at most suppliers for extended periods. I want to start producing it commercially “organic and non-gmo”. Your whole body seems to work better with natto, aside from Covid it really cleans out the arteries and enables blood to flow easier through the body. Most wouldn’t eat traditional natto, it’s like sticky snot covered soy beans, the Japanese love it.