Medik8 Crystal Retinal 1 is Medik8's entry-level gentle-strength vitamin A, ideal for those who have really sensitive skin or are looking to incorporate a low strength but highly effective vitamin A serum in their routine. Revealing younger-looking skin with just one tube*, this ground-breaking cream-serum is formulated with 0.01% Retinaldehyde, a super-charged derivative of vitamin A, which works to promote the skin's natural collagen production, rebuild lost collagen and increase cell turnover, promoting a smoother, brighter and healthier complexion. By requiring only one conversion to retinoic acid, the Crystal Retinal is clinically proven to work 11xfaster than other forms of retinol*, visibly smoothing, brightening, and firming to deliver results comparable to clinical-grade vitamin A. Trials have shown that in as little as four weeks, 97% of users felt that their skin had a more youthful appearance* resulting in a 20% reduction in visible hyperpigmentation*, a 20% reduction in th