Visible light (400-700nm) – which contributes to 45% of solar radiation, causes skin darkening and worsening of dyschromias, specifically in individuals with Fitzpatrick skin phototypes III and higher. Currently, sunscreens provide limited protection against that spectrum. Due to their capabilities in absorbing, scattering and reflecting visible light, topical products containing pigments and/or metal oxides can provide additional photoprotection.

A new study published in the Journal of Drugs in Dermatology investigated the efficacy of two formulations containing iron oxide, in preventing visible light-induced pigmentation, compared to a non-tinted mineral SPF 50+ sunscreen.

The results revealed that iron-oxide containing formulations significantly protected against visible light-induced pigmentation compared to untreated skin or mineral SPF 50+ sunscreen in Fitzpatrick IV individuals.

The findings indicated that iron-oxide containing formulas in a foundation format have dual functions and can provide additional benefits in patients daily routine by masking existing pigmentation and preventing the development of pigmentation triggered by sunlight exposure—thus, extending protection beyond UV spectrum.

Source: Journal of Drugs in Dermatology.2020 Jul 1;19(7):712-717.doi: 10.36849/JDD.2020.5032.