Sunlight Exposures Effect on Serum Vitamin D Levels

Completed · Not applicable

Conditions studied: Vitamin D Deficiency

In brief

When people eat a meal, some, but not all of the calcium in that meal is absorbed, that is, moved into the bloodstream. When the skin is exposed to sunlight during summer months, Vitamin D is made there and then modified into more active forms by the liver and kidneys. These more active forms of Vitamin D improve calcium absorption. Many adults living in the U.S. have little or no sun exposure and are low in Vitamin D. We know that specific wavelengths of sunlight called Ultraviolet-B cause Vitamin D to be made in the skin.

Key facts

Study ID

NCT00473317

Run by

Creighton University

People needed

6

Starts

2007-07-01

Expected to finish

2007-09-01

Last updated by the study team

2008-04-01

Who can join

Age: 19 and older, up to 50. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• healthy males or females ages19-50 with "light" skin (self-assessed as Fitzpatrick skin type I-III) with minimal sun exposure and exogenous sources of vitamin D.

You may not qualify if…

• less than 16 oz milk per day, less than 10 hours of sun per week, no Vitamin D supplements, no anticonvulsants, no barbiturates, no steroids, no meds that increase photosensitivity, no granulomatous disease, no liver or kidney disease, no history of skin cancer, and BMI less than 30.

Where it is running

• Creighton University — Omaha, Nebraska, United States

Full record on ClinicalTrials.gov

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