Guitarguy -- I came across this idea expressed by a layperson--no scientific proof for it that I know of: In Ayurvedic medicine, sunshine is supposed to be good for a person's circulation. Other Ayurvedic remedies, as cinnamon and ginger, have been proven in modern medical studies to be natural blood thinners. It is possible that sunshine may also thin the blood.
This article reports a study that found a "clinical trial of a biologically active metabolite of vitamin D3 demonstrated an unanticipated reduction of thrombosis in cancer patients."
http://www.sciencedaily.com/releases/20 ... 171448.htm
Just food for thought.