Retinol’s big sister, Retinal, is finally getting the shine it deserves thanks to K-beauty. The skincare world already knew Retinal works 11 times faster than Retinol but it wasn’t easy to find a stabilized Retinal product without a hefty price tag. Some of the top Retinal products that we adore are the Obagi RETIVANCE Skin Rejuvenating Complex ($138) and the Medik8’s Crystal Retinal 3 ($62). Leave it to K-beauty to blow us away with high quality Retinal that’s affordable! The…