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nightsurfer on 2009-09-01Estimation of the dietary requirement for vitamin D in free-living adults >=64 y of age.
Cashman KD, Wallace JM, Horigan G, Hill TR, Barnes MS, Lucey AJ, Bonham MP, Taylor N, Duffy EM, Seamans K, Muldowney S, Fitzgerald AP, Flynn A, Strain JJ, Kiely M.
Am J Clin Nutr. 2009 May;89(5):1366-74. Epub 2009 Mar 18.
Conclusion: To ensure that the vitamin D requirement is met by the vast majority (>97.5%) of adults aged ≥64 y during winter, between 7.9 and 42.8 µg vitamin D/d is required, depending on summer sun exposure and the threshold of adequacy of 25(OH)D. .