Having tried stinky tofu and been unable to stand it, I stay away from anything similar.
I rely on aged cheese to get my bacteria byproducts (esp. Vitamin K2).
I rely on aged cheese to get my bacteria byproducts (esp. Vitamin K2).
Natto literally has the smell and slimy, sticky texture of, well, semen. It’s easy to wonder whether someone left a bunch of used tissues out or if they simply forgot to toss out their used natto package.
Interestingly, natto is one of the few foods high in a substance called spermadine. Look it up. Supposedly contributes to longevity and supplements exist.
Natto ... I'm not such a fan.
The safest methods simply marinate tofu in fermented amaranth; the tofu itself isn't aged. But there's many approaches to it with and without questionable safety practices. I'm not sure comparisons to blue cheese or koji-fermented products are appropriate.