Maintenance of Vitamin D Level by UVB Radiation

How Much UVB Radiation is Necessary to Maintain Summer Vitamin D Level During Winter?

The purpose of the study is to determine the frequency of UVB radiations necessary to maintain the Vitamin D level during winter time.

The work is addressing vitamin D production after UVB exposure and explore how much UVB radiation which is necessary to maintain a sufficient vitamin D level during the winter period in Denmark. 4 different UVB exposure times and 2 different UVB doses to 2 different body surface areas.

Inclusion Criteria:

• 18-65 years
• Healthy

Exclusion Criteria:

• Sun bed use
• Holiday or business travel south of 45 degrees latitude during trial
• Illness
• Drug addiction
• Pregnancy
• Lactating