Environmental Influences on Vitamin D Status
Completed
Conditions studied: Vitamin D Deficiency
In brief
Vitamin D deficiency is a common problem. The principal source of vitamin D for humans is solar exposure, with cutaneous synthesis of vitamin D by photoconversion of 7-dehydrocholesterol in the skin to pre-vitamin D3. Latitude, altitude, season, skin pigmentation, and age are recognized factors that influence how much vitamin D can be made by solar exposure. However, the relative influences of each are largely unknown and we cannot reliably answer the question of how much sun exposure an individual needs at various latitudes and at various seasons in order to ensure normal vitamin D status.
Key facts
- Study ID
- NCT00780247
- Run by
- Creighton University
- People needed
- 50
- Starts
- 2008-07-01
- Expected to finish
- 2008-08-01
- Last updated by the study team
- 2008-10-27
Who can join
Age: 18 and older, up to 60. Sex: any. Healthy volunteers: accepted.
You may qualify if…
- Able to consent and come for a study visit. Male or female males and females ages 18-60.
You may not qualify if…
- Unable to consent or come to a visit, taking Vitamin D supplements, anticonvulsants, barbiturates, steroids, having granulomatous disease, or liver or kidney disease as these medications and conditions interfere with Vitamin D metabolism.
Where it is running
- Alaska Kidney and Diabetes Associates — Anchorage, Alaska, United States
Full record on ClinicalTrials.gov
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