After trying several brands, I found the perfect natto (bacterially fermented soya beans). To stay on the topic of "multi- threading": It is not too slimy that it pulls permanent threads, made with 100% whole beans and with mustard in addition to soya sauce.
I like natto, but it also helps against osteoporosis. Due to neuroborreliosis, I have been taking megadosed antibiotics for the past five years. This kills the gut flora (which produces vitamin K, which is needed for healthy bones). Natto contains a lot of vitamin K.