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No Risk Of Nanoparticles In Sunscreen Sprays

Variations in brands or formulations that amounted to hundreds of times more exposure

People can continue using mineral-based aerosol sunscreens without fear of exposure to dangerous levels of nanoparticles or other respirable particulates, say researchers. The findings published in the journal Aerosol Science and Engineering are a result of experiments conducted using three aerosol sunscreens commonly found on store shelves.

The research team simulated the application process for someone using the recommended amount of sunscreen and analyzed the released aerosols. They chose mineral-based sunscreens with silicon dioxide, zinc oxide, or titanium dioxide as the active ingredient over chemical-based sunscreens because those are more commonly recommended for children and the ingredients are deemed safe by the US. Food and Drug Administration.

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“We simulated what we considered to be a worst-case scenario for someone being exposed to aerosolized nanoparticles while applying sunscreen, and that scenario is a person applying it to their arms because the spray is so close to their face,” said study author Jeremy Gernand from the Penn State University in the US.

“And then we pulled air samples from that location,” Gernand added.

The goal of the research was to determine the size and concentration of aerosol particles at the location of a realistic breathing zone for the user and to determine if those factors posed potential health risks.

sunscreen
People prefer Mineral-based sunscreens with silicon dioxide, zinc oxide, or titanium dioxide as the active ingredient over chemical-based sunscreens. Pixabay

The team did find trace nanoparticles of the active ingredients but the amounts were hundreds of times less than the National Institute of Occupational Safety and Health recommended exposure limit.

Previous studies that pointed to dangerous exposure to nanoparticles missed the mark because they relied on an analysis of the contents, rather than field tests. The FDA completed a study on the safety of sunscreens in 2019.

Although only three products were studied, Gernand said it’s unlikely other products would produce vastly different amounts of nanoparticles. The researchers found all three products to be similar in aerosolized particles produced.

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“For a massive increase in particle exposure, the canister design would have to be dramatically different, and most likely so would the amount of and size of the active ingredients inside,” Gernand said.

Based on these results, I would be surprised to find variations in brands or formulations that amounted to hundreds of times more exposure. It’s just too far away from what we observed,” the author noted. (IANS)

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