PSA: You can avoid seasonal winter flu just by keeping your vitamin D levels up (which your body makes in response to direct sunlight.) http://scholar.google.c

PSA: You can avoid seasonal winter flu just by keeping your vitamin D levels up (which your body makes in response to direct sunlight.) http://scholar.google.com/scholar?q=vitamin+d+seasonal+flu&hl=en&btnG=Search&as_sdt=10000000000001&as_sdtp=on http://scholar.google.com/scholar?q=vitamin+d+seasonal+flu&#...