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Cosmetics 2017, 4(1), 10; doi:10.3390/cosmetics4010010

Sunburn Protection by Sunscreen Sprays at Beach

1
Johnson & Johnson Consumer Inc. Skillman, NJ 08558, USA
2
Ernest Mario School of Pharmacy, Rutgers University, New Brunswick, NJ 08901, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Marisanna Centini and Cecilia Anselmi
Received: 16 February 2017 / Revised: 1 March 2017 / Accepted: 14 March 2017 / Published: 18 March 2017
(This article belongs to the Special Issue Sunscreens: Efficacy and Safety—An Overview and Update)
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Abstract

Background: The efficacy of sunscreen is evaluated by SPF values, which are quantitatively determined in laboratories on the backs of human subjects according to a standardized procedure. However, SPF cannot be directly translated to sunburn protection under real-life situations because actual efficacy depends on various factors related to human behaviors and environmental conditions. This study clinically evaluated the efficacy of two sunscreen sprays (SPF 30 and SPF 70) under natural sunlight exposure on healthy subjects at the beach. Methods: Twenty subjects were divided into two cells for the two sunscreen sprays (SPF 70 and SPF 30) in a single-center, actual usage test. The primary endpoint of the study was sunburn protection on the dorsal arms and the secondary endpoint was protection on the face and neck. Subjects stayed at the beach for 4 h after application of the sunscreens with normal beach activities. Subjects’ behavior at the beach, the amounts of sunscreen applied and reapplied, and environmental conditions were all recorded. Results: There was no significant sunburn for a majority of the subjects in either cell. However, neither sunscreen completely blocked the sunburn, especially the face/neck area. We found that the SPF 70 sunscreen was more effective than the SPF 30 sunscreen. Conclusion: Modern sunscreen sprays, applied liberally, are effective in providing sunburn protection for the body in a beach setting. View Full-Text
Keywords: erythema; swimming; re-application; exposed skin surface; natural sunlight erythema; swimming; re-application; exposed skin surface; natural sunlight
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ou-Yang, H.; Rzendzian, R.B. Sunburn Protection by Sunscreen Sprays at Beach. Cosmetics 2017, 4, 10.

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