Brand New/Never Used! This was received in an advent calendar I recently purchased so it does not come in the box from Medik8 but in the calendar box. THis is a brand that is sold in the UK. Use the Medik8 Crystal Retinal 6 as part of an evening skincare routine. Formulated with glycerine and hyaluronic acid, it delivers a powerful hydrating effect to help soften and smooth the skin, allowing it to awaken refreshed and radiant. The advanced complex is powered by 0.06% encapsulated retinaldehyde, a form of vitamin A that works 11 times faster than retinol to target the look of pigmentation, fine lines and wrinkles for a smooth, even complexion. With stabilising vitamin E, the serum is rich in antioxidants, protecting the skin against the damaging effects of free radicals. Size: 1oz Smoke/Pet Free Home.