Medik8's Crystal Retinal Ladder reaches new heights with Crystal Retinal 20, Medik8's highest strength Retinal formulated especially for highly experienced Vitamin A users. Formulated with stabilised retinaldehyde (0.2%), a powerful derivative of Vitamin A, this ground-breaking serum works 11x faster than classic retinol. Elevated with antioxidant Vitamin E, Glycerin and Hyaluronic Acid, this supercharged formula works to visibly reduce the appearance of fine lines and wrinkles while enhancing visible tone and texture for a more youthful-looking complexion. Suitable for all skin types. Crystal Retinal 20 is only recommended for those who have comfortably used Crystal Retinal 10 every night for 3 months, or completed 2 full tubes (whichever comes sooner).