Cosmetic chemist @janethechemist breaks down the science of Crystal Retinal. Traditional retinol requires two conversion steps in the skin, whereas retinaldehyde requires only 1 making it the retinoid of choice. That means faster, age-defying results without the irritation. Safely scale your strength from Crystal Retinal 1 up to Crystal Retinal 24. Which strength are you using? Let us know below. #Medik8 #Retinal #Retinol #SkincareScience #CosmeticChemist