Nagasaki University in Japan has discovered that an amino acid called 5-ALA found in Natto, has an infection suppressing effect against COVID 19.
5-ALA is also found in red wine, and that is great news for me. I love Natto and red wine and I consume them almost every day.
Actually, it is found in many other foods; Sake, brown rice vinegar, soy sauce, octopus, squid, green peppers, spinach, bananas, and so on. It is found a lot in fermented foods.
Natto salad is a great dish to have in that case since I put brown rice vinegar and soy sauce there, as well.
The Ikigai Diet: The Secret Japanese Diet to Health and Longevity