This literature review found that mineral sunscreens using nano zinc oxide and titanium dioxide are effective at blocking both UVA and UVB rays. The study confirmed mineral sunscreens are a safe alternative to chemical sunscreens, though it acknowledges ongoing debate about whether nanoparticles in these formulas pose absorption risks—the evidence suggests they remain on the skin surface when properly formulated, but application method matters.

Researchers reviewed existing published studies on mineral sunscreen safety and effectiveness using PubMed, rather than conducting a new experiment. They synthesized findings about how zinc oxide and titanium dioxide work as physical blockers and addressed consumer concerns about nanoparticles.

Funding not disclosed in abstract