Photoprotective Ability of Coloured Iron Oxides in Tinted SPF

Light damage affects skin beyond UV, including visible and near-infrared wavelengths. This study assessed how different iron oxides in tinted SPFs block across the full light spectrum. Non-pigmented formulas protected only against UV, while red and yellow oxides offered limited coverage. Formulations containing black iron oxide—and blends of black, red, yellow, and blue—achieved broad-spectrum protection. These findings support the use of strategically pigmented tinted SPFs to enhance defence against environmental light exposure, offering a more comprehensive approach to daily photoprotection.

Title: Photoprotective Ability of Coloured Iron Oxides in Tinted SPF against Ultraviolet, Visible Light and Near Infrared Radiation

Results: Formulations without pigment or with only red and yellow oxides offered limited protection beyond UV. In contrast, those containing black and mixed iron oxides provided broad-spectrum coverage across UV, visible, and infrared light—highlighting their potential to significantly enhance daily photoprotection.