Why did Korean skincare quietly switch from retinol to retinal? Because retinal is one conversion step closer to active vitamin A — delivering prescription-adjacent results with cosmeceutical tolerability. Inside: the real clinical data, the encapsulation science K-beauty pioneered, and which K2C kits use retinal (PURITO TXA Niacinamide Retinal R359, MISSHA Retinol 500 Eye Cream R599). Take the K2C Skin Quiz to find your kit.