Hi klittr,
I should mention that natto can lower blood pressure. That is good for me because my BP is elevated, but if you have low BP you need to use caution with natto.

Hi klittr,
In reference to the concern of covid causing blood clotting, this is an excerpt from an interview with Dr. Paul Cremer of the Cleveland Clinic:
"And we've also observed that in COVID-19, patients are more likely to get blood clots in the veins, such as in the legs. And those blood clots can migrate and result in blood clots in the blood vessels of the lungs. So when we're talking about COVID-19 and this inflammatory response, we really can see an increased risk for blood clots in small and larger blood vessels, and in arteries as well as veins, and so it's something we very much need to look out for in these patients."
(They do not allow links to be posted so I took out the dashes and slashes,)
cleveland clinic podcasts health essentials how does covid19 affect the heart with dr paul cremer
Dr. Beverly Hunt in UK:
"As far as the stickiness is concerned, we are talking about changes in the blood proteins. The commonest cause of these changes is being ill.
If you’re ill, you produce chemical cytokines that tell the liver to make more clotting proteins. Then your blood is full of clotting proteins that make it very sticky and very ready to clot." medical news today articles covid-19 I've never seen-such-sticky-blood-says-thrombosis expert Inflammation-and-thrombosis

Article from Cleveland Clinic: " But a certain amount of clotting-ability in your blood is important for your health. The ability for your blood to clot is what keeps you from bleeding out after an injury. Blood that’s too thin can make you bruise more easily and even leave you at risk for dangerous internal bleeding.

Vitamin K can help keep your blood not too thick and not too thin. In the words of Goldilocks, it keeps your blood just right.

At this point, researchers have yet to determine if vitamin K1 or vitamin K2 are equally responsible for clotting or if one is any more effective than the other when it comes to blood clotting. "
health cleveland clinic vitamin k