Improving the UV Exposure of Sunscreen During In vitro Testing

Several methods and standards have been proposed to determine the protection factor of sun products using indicators such as SPF, UVA protection factor (UVA-PF) and critical wavelength (CW) or broad spectrum efficacy. Although in vivo tests have interesting advantages, in vitro methods are more frequently used for practical, economical and ethical reasons. Recently, several key parameters were identified^1–4 for the improvement of in vitro sunscreen testing.