My understanding is soy acts as an agonist at specific estrogen receptor sites and acts as an antagonist at others. The same for hops, licorice, kudzu, and psoralea. I am fond of psoralea, a natural dopamine reuptake inhibitor. In your case, accutane acts as a retinoid agonist and retinoid antagonist at different receptor sites. I’ve read a PAS victim describe having the symptoms of both low vitamin A and high vitaminn A at the same time. In my case, saw palm acts as an estrogen receptor blocker in the prostate. I do not believe fin or accu influence estrogen.
Anyway, as I said above, you can use other beans, red, black, pink, navy, chickpeas, lentils to make natto. The nattokinase enzyme could be lower or higher though, I do not know. Also anyway, the bacteria produce digestive enzymes that break down the components of the soybeans into different compounds. This is similar to how the bacteria in sourdough cultures break down the gluten in wheat. All my life, too much wheat too often bothers my gastrointestinal tract. It cannot be the gluten because barley and rye have gluten, yet they don’t bother me. Nonetheless, fermented wheat does not bother me. Most sourdough on the store shelves is fake, not fermented long enough if at all, and contain additives to make it taste like the real stuff. There is also imposter natto on store shelves; the same with sauerkraut. I prefer to make my own; it tastes better and costs less money.
Histamine is not entirely bad. It is supposed to be the mother of all neurotransmitters.