A 62 yo friend was developing memory and learning problems, as in early dementia. An MRI of the brain showed reduced lumen size in the arteries of the frontal lobe. He started taking Natto-Serrazime (a version of N-K). Within two months he felt a slight improvement. After six months he was pretty much back to his old witty, sarcastic self.Honestly, if Robert McCullough recommends it - I think it might have some value. It has been marketed as being useful to remove atherosclerotic plaque build-up; my mom's caridologist had recommended it to her. (She had many strokes pre-Covid before she passed). Its pushed frequently along with serrapeptidase, although theoretically the latter is only supposed to be taken for a month.
Ideally it is taken 1x/six hours totally away from food. That schedule was difficult to keep, so he ended taking two 2x/day, and that appeared to work well. Two late at night, and two about 6 am. Earlier in his life he was a drinker, and sometimes a smoker. I suspect that the sugar in the alcohol was the main cause of plaque build up in his arteries. 15 years after stopping drinking, the frontal lobe issues cropped up.
Natto-Kinase is also believe to destroy the spike proteins produced by the vaccine.