Just "D" Facts about Vitamin D

Benefits of Moderate UV Sunshine Exposure

Sunlight and Artificial Ultraviolet B Radiation

Posted by D3forU on June 16, 2010

by Dr Michael Holick

Sensible sun exposure can provide an adequate amount of vitamin D3, which is stored in body fat and released during the winter, when vitamin D3 cannot be produced.7, 15, 85, 108, 109, 110

Exposure of arms and legs for 5 to 30 minutes (depending on time of day, season, latitude, and skin pigmentation) between the hours of 10 a.m. and 3 p.m. twice a week is often adequate. 2, 7, 108, 109, 110

Exposure to one minimal erythemal dose while wearing only a bathing suit is equivalent to ingestion of approximately 20,000 IU of vitamin D2. 1, 2, 7, 85

The skin has a great capacity to make vitamin D3, even in the elderly, to reduce the risk of fracture.109, 110, 111

Most tanning beds emit 2 to 6% ultraviolet B radiation and are a recommended source of vitamin D3 when used in moderation.111, 112, 113, 115

Tanners had robust levels of 25-hydroxyvitamin D (approximately 45 ng per milliliter [112 nmol per liter]) at the end of the winter and higher bone density as compared with nontanners (with levels of approximately 18 ng per milliliter [45 nmol per liter]). 112

For patients with fat malabsorption, exposure to a tanning bed for 30 to 50% of the time recommended for tanning (with sunscreen on the face) is an excellent means of treating and preventing vitamin D deficiency (Table 3). 113

This reduces the risk of skin cancers associated with ultraviolet B radiation.



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