After developing a suspected small dvt in my lung, I decided it was safest to keep my blood thin, at least for several months. After researching natural blood thinners I decided on nattokinase. I started take a 4000fu nattokinase daily. By two months, the small niggly pain in my lung had disappeared! BUT I also realized I had stopped putting eye drops into my chronic dry eyes! (I had been putting eye drops into my dry eyes at least 6 times a day). Nattokinase is now part of my daily supplements and my eyes are CURED. Is there a correlation between thinner blood and therefore thinner other bodily fluids such as tears?