Sun Protection by Beach Umbrella vs Sunscreen With a High Sun Protection Factor: A Randomized Clinical Trial
Ou-Yang H, Jiang LI, Meyer K, Wang SQ, Farberg AS, Rigel DS
JAMA Dermatol. 2017;153:304-308

Background
Sunscreen use reduces the risk for nonmelanoma and melanoma skin cancers, chronic actinic damage, and acute phototoxic reactions.[1] Nevertheless, many of those at risk for skin cancer—often influenced by professional and social media sources—are reluctant to apply sunscreen due to perceived but unsubstantiated health risks; these include paradoxical carcinogenicity, nanoparticle-induced skin and organ toxicity, vitamin D deficiency, and concerns about benzophenone-induced hormonal disruption.[2,3]