I am not an expert on this issue but there are some studies showing that
nattokinase is a powerful fibrinolytic enzyme preventing thrombosis. The
problem with warfarin like blood thinning medications is that while they
prevent arterial clotting they induce arterial calfication at the same time
because they prevent the full carboxylation of matrix Cla protein. That does
not happen if you use nattokinase. So my personal opinion is that
nattokinase is probably a much safer fibrinolytic agent than warfarin.
Consuming nattokinase as the fermented food /natto/ is probably even better
as you get an ample amount of specific vitamin K2 (meaquinone-7) and soy
flavonoids at the same time.

Clin Hemorheol Microcirc. 2006;35(1-2):139-42.
Effects of nattokinase, a pro-fibrinolytic enzyme, on red blood cell
aggregation and whole blood viscosity.
Pais E, Alexy T, Holsworth RE, Meiselman HJ.
Department of Physiology and Biophysics, Keck School of Medicine, University
of Southern California, Los Angeles, CA 90033, USA.

The vegetable cheese-like food, natto, is extremely popular in Japan with a
history extending back over 1000 years. A fibrinolytic enzyme, termed
nattokinase, can be extracted from natto; the enzyme is a subtilisin-like
serine protease composed of 275 amino acid residues and has a molecular
weight of 27.7 kDa. In vitro and in vivo studies have consistently
demonstrated the potent pro-fibrinolytic effect of the enzyme. However, no
studies to date have evaluated the effects of nattokinase on various
hemorheological parameters and thus we have begun to assess the effects of
the enzyme on RBC aggregation and blood viscosity. Blood samples were
incubated with nattokinase (final activities of 0, 15.6, 31.3, 62.5 and 125
units/ml) for 30 minutes at 37 degrees C. RBC aggregation was measured using
a Myrenne MA-1 aggregometer and blood viscosity assessed over 1-1000 s(-1)
with a computer controlled scanning capillary rheometer (Rheolog). Our in
vitro results showed a significant, dose-dependent decrease of RBC
aggregation and low-shear viscosity, with these beneficial effects evident
at concentrations similar to those achieved in previous in vivo animal
trials. Our preliminary data thus indicate positive in vitro hemorheological
effects of nattokinase, and suggest its potential value as a therapeutic
agent and the need for additional studies and clinical trials. PMID:
16899918

http://tinyurl.com/24qx6c

Yes, I take 2000 IU of vitamin D.  I'm a little leery  of fat soluble
vitamins so I go slow.  Sort of like the Vitamin A usage described below.

Vitamin A I use only when my elbows look dry usually in early February.  
Then I take 5000 IU a day for a week then 5000 IU  once a week then 5000
IU  once a month till late spring.

 Hope the Saunas are cooking in Finland!

Bill

Thanks for the heads up.

http://www.weird-food.com/weird-food-vegetable.html

 My good friend Dat was over in Sweden and at dinner his host brought
out a can of spoiled herring that was under pressure.  They opened it
and thought this Vietnamese guy would wince.  Nay it was just like blue
cheese almost :))

 Strange stuff with no side effects are on my agenda to investigate.

Interesting being Omnivores  but  I wonder if  other mammals get Cardio
issues like us?

Bill who eats head cheese, Pigs feet and yes Scapple  but not Blood
pudding I do have some limits or is it potential to learn.  59 Rotations
about our sun.

That reminded me of a nice off-topic story.

http://tinyurl.com/yswp7d