Jean-Louis Refregier

In vivo measurement of the photostability of sunscreen products using diffuse reflectance spectroscopy

Background/Aim: The issue of the photostability of sunscreens has been frequently raised because of the possible loss of photoprotection, mainly in the UVA range, during sun exposure. Up to now, in vitro techniques have been mainly proposed to evaluate photostability. These techniques have generated controversial debates concerning the predictive value of these in vitro observations in relation to the in vivo reality during sun exposure.