UVB Light and Sunscreen
Patients need vitamin D which is normally produced in the skin in response to ultraviolet light from the sun. Vitamin D is important for calcium absorption and good bone health. Physicians have been using sunscreens to protect patients from skin cancer and the aging effects of sunlight for a least a half a century. Dermatologists have promoted sunscreen use to restrict sunlight exposure especially in white Caucasians. If this behavior is done 100% of the time when outdoors individuals may suffer from vitamin D deficiency. It is impossible to influence persons' behavior to wear sunscreens all the time when outdoors. With the use of sunless tanning agent (DHA), once a week, we can obtain a continuous sunscreen in the top layer of the skin that will not wash off, can't be removed with soap and water, or removed by perspiration. Under these circumstances we can answer the scientific question, will sunscreen use inhibit the production of vitamin D in the skin?
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||3% Dihydroxyacetone (DHA or Sunless Tanning Agent) Inhibits Vitamin D Production in the Skin in Response to Ultraviolet Light|
- To measure the response of 25(OH)D to 40 milliJoules of UV-B light in white Caucasians with melanoidins-sunscreen from 3% DHA in comparison to the response of control subjects who have not used 3% DHA. [ Time Frame: 1 month ] [ Designated as safety issue: No ]
|Study Start Date:||May 2008|
|Study Completion Date:||February 2009|
|Primary Completion Date:||February 2009 (Final data collection date for primary outcome measure)|
Experimental: Tanning spray
To characterize the 25(OH)D response to 4 weeks of thrice weekly 40 mJ of UV-B light in a group of normal subjects with skin types I and II while using multiple applications of 3% DHA for five weeks.
Other: Tanning spray
using 3% DHA twice a week for the 1st week and then once a week for 4 weeks and receiving 40mJ UV-B phototherapy three times a week for four weeks
Active Comparator: UVB
To characterize the 25(OH)D response to 4 weeks of thrice weekly 40 mJ of UV-B light in a control group of normal subjects with skin types I and II who are not using 3% DHA applications.
receiving 40mJ UV-B phototherapy three times a week for four weeks
|United States, Nebraska|
|Omaha, Nebraska, United States, 68131|
|Principal Investigator:||Laura A Armas, MD||Creighton University|