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Supplements of 20 microg/d cholecalciferol optimized serum 25-hydroxyvitamin D concentrations in 80% of premenopausal women in winter.\nNelson ML, Blum JM, Hollis BW, Rosen C, Sullivan SS.\nJ Nutr. 2009 Mar;139(3):540-6. Epub 2009 Jan 21.\nPMID: 19158226

Chatfield SM, Brand C, Ebeling PR, Russell DM. Vitamin D deficiency in general medical inpatients in summer and winter. Intern Med J. 2007 Jun;37(6):377-82. PMID: 17535381 [PubMed - in process]

Vitamin D supplementation during Antarctic winter. Smith SM, Gardner KK, Locke J, Zwart SR. Am J Clin Nutr. 2009 Apr;89(4):1092-8. Epub 2009 Feb 18. PMID: 19225122 doi:10.3945/ajcn.2008.27189

EPIDEMICS' TIMING DETERMINED BY LATITUDEGoing back to 1945, Hope-Simpson discovered that influenza epidemics above 30 degrees latitude in both hemispheres occurred during the six months of least solar radiation and that outbreaks in the tropics almost always occured during the rainy season. He thus concluded, "Latitude alone broadly determines the timing of the epidemics in the annual cycle, a relationship that suggests a rather direct effect of some component of solar radiation acting positively or negatively upon the virus, the human host, or their interaction." That is, something may be regularly reducing our immunity every fall and winter. In 2003 researchers confirmed that influenza epidemics in the tropics occur, with few exceptions, during the rainy season, when vitamin D levels should be falling

Estimation of the dietary requirement for vitamin D in healthy adults.\nCashman KD, Hill TR, Lucey AJ, Taylor N, Seamans KM, Muldowney S, Fitzgerald AP, Flynn A, Barnes MS, Horigan G, Bonham MP, Duffy EM, Strain JJ, Wallace JM, Kiely M.\nAm J Clin Nutr. 2008 Dec;88(6):1535-42.\nPMID: 19064513 [