Improving Photoprotection and Implications for 25(OH)D Formation

Abstract

Background/Aim: This review examined the implications of using sunscreen photoprotection on 25(OH)D formation and determined the best photoprotective method to reduce the risk of skin cancer caused by ultraviolet radiation (UVR). Based on previous studies on 25(OH)D formation after use of different amounts of sunscreen and different doses of UVR for approximately one week to different body areas it is possible to estimate the amount of 25(OH)D formed after a week's holiday in Southern and Northern Europe. Conclusion: The best method of photoprotection by sunscreen is two consecutive applications before sun exposure, ensuring the use of sufficient amounts of sunscreen and minimizing the unprotected skin areas. The double application method simultaneously ensures a high photoprotection against erythema from sun exposure. Despite the use of sunscreen, the calculated serum 25(OH)D levels clearly increase to similar levels as those measured after sun vacations.