Sunscreen Efficacy Against UVA1- And Visible Light-Induced Skin Pigmentation Is Influenced by Ancestry

Area of Science:

• Dermatology
• Photoprotection
• Cosmetic Science

Background:

• Skin phototype influences susceptibility to UV radiation and visible light.
• Tailored photoprotection is essential for diverse populations.
• Ancestry's role in sunscreen efficacy requires further investigation.

Purpose of the Study:

• Evaluate sunscreen protection against UVA1 and visible light (VL).
• Compare sunscreen efficacy between Han Chinese and European ancestry groups.
• Determine if ancestry impacts photoprotective effects beyond skin phototype.

Main Methods:

• Two sunscreen formulations tested on 40 volunteers (20 Han Chinese, 20 European ancestry).
• Participants matched for phototype, pigmentation, gender, and age.
• Skin pigmentation responses analyzed after exposure to VL, UVA1, and combined VL+UVA1.

Main Results:

• Both sunscreens effectively protected against VL, UVA1, and combined VL+UVA1 exposure.
• Significant differences in photoprotective efficacy against UVA1-induced pigmentation were observed between ancestries.
• One sunscreen demonstrated superior protection for Han Chinese participants.

Conclusions:

• Sunscreen efficacy can vary significantly across different ancestries.
• Ancestry is a crucial factor to consider in sunscreen formulation and recommendation.
• Future sunscreens should be tailored to both phototype and ancestry.