Best OTC retinoids! Retinoid is basicallt an umbrella term for both over-the-counter retinol and prescription retinoids. Here are my picks over the counter which include adapalene, retinaldehyde, retinal, and retinol. #bestretinol #bestretinoid #retinolskincare #drheejink #drkohskincare #skincaretips #boardcertifieddermatologist #koreanskin