Natto (k2) for BP control? Havent heard from it before for that purpose
Yes, it is a blood thinner and pretty common with regards to regulating BP.
"Nattokinase reinforces the actions of plasmin, your body’s own enzyme that breaks down the clotting agent called fibrin, thereby preventing abnormal thickening of the blood and helping to lower blood pressure." -Dr. Stephen Sinatra
The Benefits of Nattokinase on Blood Pressure
In 1980, while studying physiological chemistry at the University of Chicago Medical School, Japanese researcher Hiroyuki Sumi accidentally discovered that a traditional Japanese soy cheese which had been consumed for centuries, called "natto", had the ability to dissolve clots. His research group published a paper on the discovery in 1987.
"Traditionally, Natto has been consumed not only for cardiovascular support, but also to lower blood pressure. This was confirmed by several clinical trials in 1995, at MiyazakiMedicalCollege and KurashikiUniversity in Japan where the effects of nattokinase on blood pressure in both animal and human subjects was studied. The researchers found that natto inhibits angiotensin converting enzyme (ACE), which has a lowering effect on blood pressure. In one Human Study, Nattokinase ingestion was associated with a 10 percent drop in blood pressure. Natto is a nutritional supplement which is considered safe, However, people with bleeding disorders or on blood thinners should use nattokinase only under medical supervision."
http://www.ncbi.nlm.nih.gov/pubmed/18971533