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Power for quick wrinkle reduction – wrinkle reduction with just 1 tube. Retinaldehyde works up to 11 times faster than classic retinol. Radiant, youthful skin – provides a remarkable visible improvement of texture, brightness, firmness and clarity. Vitamin A is one of the important pillars of Medik8's simple yet effective anti-ageing strategy based on the use of vitamin C and sun protection during the day and vitamin A at night. This is called the CSA philosophy. Professional results – Our iconic retinaldehyde serum has antibacterial properties that fight the bacteria responsible for blemishes and visibly clarify the skin. Our formula contains the most important ingredients: hyaluronic acid, vitamin E and glycerin. Application – Step 1: After evening cleaning, apply 2 pumps Crystal Retinal to the face and neck. Allow to soak in and then apply a moisturiser. Step 2: If you are using Crystal Retinal for the first time, you should gradually introduce the application. Use twice weekly for the first 2 weeks, every other evening for the next 2 weeks and then every evening. Progressive strengths – Our unique scale with 5 progressive strength levels (0.01 - 0.2% retinaldehyde) means you can always achieve better results to combat the most stubborn fine lines, wrinkles and dark spots.