There have been concerns that nanoparticles in sunscreen may be toxic, which has many people asking, “Are sunscreens safe?”
Despite what you may have read about the potential toxicity of sunscreens, new research refutes the widespread claims about the safety of nanoparticulate-based sunscreens.
According to a study by the University of Queensland (UQ) and University of South Australia (UniSA), zinc oxide nanoparticles used in sunscreen neither penetrate the skin nor cause cellular toxicity after repeated applications.
Is sunscreen toxicity a myth?
Professor Michael Roberts, the lead investigator, says that the myth about sunscreen toxicity took hold after previous animal studies found much higher skin absorption of zinc-containing sunscreens than in human studies.
“There were concerns that these zinc oxide nanoparticles could be absorbed into the epidermis, with toxic consequences, including DNA damage,” Professor Roberts says.
Professor Roberts and his co-researchers in Brisbane, Adelaide, Perth and Germany studied the safety of repeated applications of zinc oxide nanoparticles applied to five volunteers aged 20-30 years.
Volunteers applied the ZnO nanoparticles every hour for six hours on five consecutive days.
“Using superior imaging methods, we established that the nanoparticles remained within the superficial layers of the skin and did not cause any cellular damage,” Professor Roberts says.
Using sunscreen is better than skin cancer
“We hope that these findings help improve consumer confidence in these products and in turn lead to better sun protection. The terrible consequences of skin cancer and skin damage caused by prolonged sun exposure are much greater than any toxicity posed by approved sunscreens.”
Source: University of South Australia via www.sciencedaily.com
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