Can a cream stop light from darkening your skin?

This study tested seven different cosmetic creams to see if they could prevent skin darkening caused by high-energy visible light (like from the sun or screens). 33 healthy adults with fair to medium skin had creams applied to their back before being exposed to a specific blue-violet light. Researchers measured skin color changes and checked for redness or irritation over 7 weeks to find out which products worked best.