Group annotations on this page
nightsurfer on 2009-08-29Low vitamin D status despite abundant sun exposure.
Binkley N, Novotny R, Krueger D, Kawahara T, Daida YG, Lensmeyer G, Hollis BW, Drezner MK.
J Clin Endocrinol Metab. 2007 Jun;92(6):2130-5. Epub 2007 Apr 10.
CONCLUSIONS: These data suggest that variable responsiveness to UVB radiation is evident among individuals, causing some to have low vitamin D status despite abundant sun exposure. In addition, because the maximal 25(OH)D concentration produced by natural UV exposure appears to be approximately 60 ng/ml, it seems prudent to use this value as an upper limit when prescribing vitamin D supplementation.