The Influence of the Cosmetic Formulation on the Radical Status of Skin 

All skin treatments that influence the hydration degree of the skin and/or its barrier function may have a measurable influence on the radical generation. The highest effect was measured, when a solution of glycerine and water (50:50, w/w) was applied on the skin. The amount of free radicals compared to untreated skin was nearly doubled. Thus, there are no placebos, from a dermatological viewpoint. Beyond the extinction characteristics of UV filters, their distribution inside a cosmetic formulation as well as their distribution pattern on the skin’s surface are the most important parameters that drive the efficacy of sunscreens.

The more homogeneous is the film of UV filters on the skin, the higher will be the protective effect. The three model formulations, each exemplary for common sunscreen sprays, lotions, and creams, have very different performance on the skin.



Gematria Test Lab是一家专业的家用、工业和化妆品行业的服务提供商。专门从事自由基的研究。Gematria 服务项目包括抗氧化力、抗自由基电位法、包裹率、自由基防护因子、自由基日光/皮肤防护因子、皮肤抗氧化防护和传输系统稳定性的测试。