Product details:Medik8 has long been considered royalty of the retinal world, and its supercharged Crystal Retinal 20 (30ml) takes the brand's reign to new, skin-smoothing heights... This silky night serum for retinal regulars contains the strongest concentration of vitamin A to come out of the Crystal collection to date (that's a potent 2.0% retinaldehyde for all the skingredient buffs out there). Expect a complexion that appears smoother, brighter and oh-so-supple. That's not all though: the addition of hyaluronic acid, vitamin E and glycerin provides a soothing and hydrating pick-me-up to ensure that this super serum is gentle to even sensitive skin types. Medik8 Crystal Retinal 20 Serum 30ml