Kojic acid is a naturally occurring metabolite produced by fungi with the ability to inhibit tyrosinase activity during melanin synthesis. Its primary applications in cosmetics are based on its antioxidant, anti-proliferative, anti-inflammatory, UV protective, and skin-brightening properties.

Retinol, a derivative of vitamin A, has long been an essential component in skincare routines. Its benefits include improving skin texture, boosting collagen production, and reducing dark spots. However, using retinol comes with certain guidelines, and one common question is, "Do you need to turn off the lights after applying retinol?"