Sunscreen: Persistence of Sun Protection Factor and the Influence on Vitamin D

Sunscreen Removal by Clothing Meassured in Vivo. Sun Protection Factor Persistence During a Day Indoor Without Physical Activity. Does Sunscreen Reduce Vitamin D?

The investigators want to investigate whether sunscreen is removed by clothing and to what extend when the amount of sunscreen applied varies.Does clothing reduce the SPF when clothes are put on 20, 8, or 4 minutes after sunscreen application? The investigators also want to investigate the persistence of sunscreen during eight hours indoor. How much does the SPF reduces? Furthermore, we want to investigate whether sunscreen in the layers 2, 1, and 0.5 mg/cm2 reduce the vitamin D production in the skin.

Inclusion Criteria:

• Healthy participants.
• > 18 years.
• Skin type I, II, and III.

Exclusion Criteria:

• Pregnancy.
• Medicin use.
• Skin or other diseases.
• The participants must not have been in solarium or gotten sun on their trunks in the 3 months before the study start and during the study.
• Skin types IV and above.