Retinol

Retinol and retinal are go-to actives for smoother, firmer-looking skin over time, and Korean formulas tend to pair them with soothing ingredients to keep irritation in check. This collection ranges from gentle starting points like Dr. Althea's 0.1% Gentle Retinol Serum through to stronger options like Cos De BAHA's RS Retinol 2.5 Serum, plus targeted picks like Beauty of Joseon's Retinal eye serum and VT Cosmetics' Reti-A Reedle Shot. If you're new to retinol, start low and build up frequency slowly, and always follow with SPF the next day.