Detailed answer

Serums, especially those containing active ingredients like retinol, vitamin C, or AHAs, can cause increased sensitivity to the sun. These ingredients can make the skin more prone to sunburn and damage. It is important to use sunscreen with a high SPF and to reapply regularly when using serums that may increase sun sensitivity. Additionally, it is advisable to apply serums at night or use them in conjunction with a broad-spectrum sunscreen during the day to minimize the risk of sun damage.