The food natto has vitamin K in it, but nattokinase sold as a supplement generally does not. Nattokinase by itself is very healthy for the cardiovascular system, even apart from its ability to degrade the toxic spike protein https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6043915/ .
I already take vitamin k (along with d3) supplement. I recently bought a nattokinase supplement. Does that give me the full range of whatever it is that nattokinase provides?
Serrapeptase is better than Nattokinase. Also, K2 is what is needed and in MG. dosage. Nattokinase is better used in a cycling method.