Just "D" Facts about Vitamin D

Benefits of Moderate UV Sunshine Exposure

Do You Know Your Vitamin ‘D’ Score? Here are levels from recent studies

Posted by D3forU on January 8, 2011

Indoor tanning clients have 90 percent higher vitamin D blood level scores as compared to non-tanners — levels that are close to what outdoor workers and non-human primates who live outdoors in the sun naturally have.

2010-12-16 Know D Score copy

“Sunbeds that emit UVB — and more than 90 percent of them do — make vitamin D much the same way as natural sunshine triggers vitamin D production in your skin,” Smart Tan Vice President Joseph Levy says. “While the academic world fights the political game of figuring out how much vitamin D they think people need, no one can argue that indoor tanners have levels consistent with what people and primates make naturally when they live intended outdoor lives. Nature never intended for humans to live and work indoors in cubicles.”

Do you know your vitamin D blood level? It’s measured in what is called a “calcidiol test” (a 25-hyrdoxy vitamin D test). Results are delivered in nanograms per milliliter (ng/ml) or in nanomoles per liter (nmol/L) in Canada. (1 ng/ml = 2.5 mnol/L). Here are levels from recent studies:

Non-human primates(1): 50-80 ng/ml

Outdoor workers (1,2): 49-50 ng/ml

Indoor tanners(3): 43-49 ng/ml

Non-tanners(4): 23-25 ng/ml

Dermatologists(5): 13-14 ng/ml


1. Vieth R. Why the optimal requirement for Vitamin D3 is probably much higher than what is officially recommended for adults. J of Steroid Biochemistry & Molecular Biology 89–90 (2004) 575–579

2. Barger-Lux MJ, Haney R. Effects of Above Average Summer Sun Exposure on Serum 25-Hydroxyvitamin D and Calcium Absorption. J of Clinical Endocrinology & Metabolism 2002; 87(11):4952–4956

3. Tangpricha et al. Tanning is associated with optimal vitamin D status (serum 25-hydroxyvitamin D concentration) and higher bone mineral density. Am J Clin Nutr 2004;80:1645–9

4. Ginde A. Demographic Differences and Trends of Vitamin D Insufficiency in the US Population, 1988-2004. Arch Intern Med. 2009;169(6):626-632

5. Czarnecki D et al. The vitamin D status of Australian dermatologists. Clinical and Experimental Dermatology 34; 624-25.


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