Product details:With 0.01% encapsulated retinaldehyde, AKA retinal, the Crystal Retinal 1 Serum (30ml) is your new hard-working hero serum, plumping, softening and firming the look of skin. A cream-like serum that effortlessly melts into skin, this is your new nighttime treat. Providing the same results as retinol but up to 11 times faster, retinal works to boost the appearance of collagen-rich skin, revealing bouncy and dewy results. Encased in a crystal structure that can be broken down by the skin's natural enzymes, retinal is easily absorbed, allowing the slow release of vitamin A while you sleep. Add hyaluronic acid, vitamin E and glycerin into the prodigious blend, and you have a serum that deeply hydrates, for a healthy-looking, supple complexion. Medik8 Crystal Retinal 1 Serum 30ml