- Retinaldehyde is the star of Crystal Retinal; a next-generation form of Vitamin A that is proven to deliver results up to 11x faster than retinol - Clinically proven to provide incredible age-defying results in just one tube: think visibly brighter, firmer, and smoother-looking skinMedik8 Crystal Retinal™ 6 Read Emilys Review of Medik8 Crystal Retinal here Winner Of Best Retinol Product - Marie Claire Awards 2022! Ultimate Overnight Vitamin A Serum with 0.06% Stabilised Retinaldehyde Crystal Retinal™ speeds up cellular turnover and increases the skin’s natural mechanisms for collagen production. Unlike other forms of retinol, it's formulated with a supercharged derivative of Vitamin A, retinaldehyde. This high-performance, retinaldehyde is an encapsulated active that only requires one conversion to retinoic acid, giving results comparable to clinical grade, and is up to 11x faster in the skin than classic forms of retinol. Medik8’s crystal encapsulation acts as a time-release m