From: Low Vitamin D Status despite Abundant Sun Exposure

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Vitamin D (Vit D) is produced endogenously by exposure of skin to sunlight, and is absorbed from foods containing or supplemented with Vit D. Vit D is.

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From: Low Vitamin D Status despite Abundant Sun Exposure Fig. 2. Low vitamin D status in highly sun-exposed subjects. When an accepted cutpoint of 30 ng/ml is used to define low vitamin D status, 51% of these subjects (open bars) are low. From: Low Vitamin D Status despite Abundant Sun Exposure J Clin Endocrinol Metab. 2007;92(6):2130-2135. doi:10.1210/jc.2006-2250 J Clin Endocrinol Metab | Copyright © 2007 by The Endocrine Society

From: Low Vitamin D Status despite Abundant Sun Exposure Fig. 3. PTH and 25(OH)D. Specific 1–84 PTH or whole PTH (“CAP PTH”) was not related to serum 25(OH)D status measured by HPLC in this cohort. From: Low Vitamin D Status despite Abundant Sun Exposure J Clin Endocrinol Metab. 2007;92(6):2130-2135. doi:10.1210/jc.2006-2250 J Clin Endocrinol Metab | Copyright © 2007 by The Endocrine Society

From: Low Vitamin D Status despite Abundant Sun Exposure Fig. 1. Amount of sun exposure without and with sunscreen. The mean self-reported sun exposure without sunscreen use was 22.4 h (range 2–96), with a mean total of 28.9 ± 1.5 h/wk. Of this cohort, 40% reported no sunscreen use. From: Low Vitamin D Status despite Abundant Sun Exposure J Clin Endocrinol Metab. 2007;92(6):2130-2135. doi:10.1210/jc.2006-2250 J Clin Endocrinol Metab | Copyright © 2007 by The Endocrine Society

From: Low Vitamin D Status despite Abundant Sun Exposure Fig. 4. Comparison of 25(OH)D as measured by HPLC and RIA. Although the correlation between these assays is good, a positive bias of 6.8 ng/ml is present using the Diasorin RIA in comparison to the HPLC assay used in this study. From: Low Vitamin D Status despite Abundant Sun Exposure J Clin Endocrinol Metab. 2007;92(6):2130-2135. doi:10.1210/jc.2006-2250 J Clin Endocrinol Metab | Copyright © 2007 by The Endocrine Society

From: Low Vitamin D Status despite Abundant Sun Exposure Fig. 5. Circulating vitamin D<sub>3</sub> in relationship to 25(OH)D concentration. In this population of 19 individuals with a mean sun exposure without sunscreen of 20.2 h/wk and a mean sun exposure index of 10.9, low circulating vitamin D<sub>3</sub> values exist. From: Low Vitamin D Status despite Abundant Sun Exposure J Clin Endocrinol Metab. 2007;92(6):2130-2135. doi:10.1210/jc.2006-2250 J Clin Endocrinol Metab | Copyright © 2007 by The Endocrine Society