Assessment of thickness of photoprotective lipsticks and frequency of reapplication: results from a laboratory test and a field experiment.

BACKGROUND The thickness of the sunscreen layer that is actually applied by consumers under usual conditions has been determined for photoprotective lotions and creams; however, this question is still unanswered for photoprotective lipsticks. OBJECTIVES To assess lipstick thickness (area density) and frequency of application per day for two commercially… CONTINUE READING