Public concerns about nanoparticle sunscreens are misplaced, according to a review which found them safe and effective.
The available evidence indicates that nanomaterials don't penetrate the skin's surface and actually decrease the levels of harmful free radicals in the skin, says Associate Professor Paul Wright from RMIT University in Melbourne.
His review is published in the latest Medical Journal of Australia.
The concern about nano-sunscreens began in 2008, after a report saying nanoparticles could bleach the painted surfaces of coated steel.
But Prof Wright said this is a different exposure situation to the use of nano-sunscreens by people.
"Here they are formulated to remain on the skin's surface, which is constantly shedding its outer layer of dead cells," he wrote.
Zinc oxide nanoparticles are considered beneficial in sunscreens because they are broad spectrum UV filters, UV-stable, non-irritating, hypoallergenic, and transparent.
The review showed the known benefits clearly outweigh the risks of using nano-sunscreens, he said.
"The important message to be communicated to the Australian public is that the danger of excessive UV light itself with respect to skin damage and cancer is far greater than the perceived risk posed by nano-sunscreens, which is not supported by the scientific literature.
"It is crucial that people do not stop using the most effective broad spectrum sunscreens as part of their sun protection measures."
Share
