Does Sunbed Radiation With Mainly UVA Provoke Cutaneous Vitamin D Synthesis in Humans?

Sunbed Radiation Provoke Cutaneous Vitamin D Synthesis in Humans, a Randomized Controlled Trial

We would investigate in a controlled, randomized open study in the winter season: 1) If serum levels of vitamin D (25(OH)D) increase in subjects treated with sunbed with sunlamps emitting mainly UVA and only 0·5% or 1·4% UVB compared to non-sunbed treated controls 2) If yes, are the 25(OH)D serum levels then dependent on the UVB dose?

Inclusion Criteria:

• Healthy
• Females
• Above 50 years
• Younger with serum concentration of 25(OH)D below 50nmol/l

Exclusion Criteria:

• No sunbed use last ½ year
• No sun holiday last ½ year
• No intake of vitamin D above 10 microgram/day