Some Popular Sunscreens Lose Effectiveness and Become Harmful During Sun Exposure

During use, some sunscreens offer very limited protection against dangerous sunrays and may even be harmful.
Chemical reactions involving a main ingredient — zinc oxide — mean many sunscreens become ineffective after just two hours of sun exposure, according to a new collaborative study between the University of Leeds, the University of Oregon, and Oregon State University.

Researchers are now calling for innovative new ingredients to be considered for use as ultraviolet (UV) filters to help provide effective protection.
Richard Blackburn, Professor of Sustainable Materials at Leeds’ School of Design, led the Leeds part of the study, and worked with the two …