Retinol, also known as vitamin A, is often considered the gold standard in anti-aging skincare. When applied to the skin, it converts into retinoic acid, the active form of vitamin A. Retinoic acid contributes to collagen synthesis and prevents its breakdown, making skin look visibly plumper and younger. It can also help speed up the natural exfoliation process and reduce melanin production, for a visibly smoother, more even-toned complexion. This results-boosting serum is enriched with Climbazole, a proven retinol booster. Climbazole helps block the enzyme that breaks down retinoic acid, leaving a reservoir of retinoic acid in the skin. This prolongs and enhances the anti-aging effects without causing any additional irritation. Retinol may cause some irritation when first introduced into a skincare regimen. Time-Release Technology, found in all Medik8 vitamin A products, helps minimize irritation while maximizing visible results. Our Intelligent Retinol Serum protects the retinol in a polymer reservoir, which essentially works as a protective shield between the retinol and your skin. The polymer reservoir slows down how quickly the retinol is able to penetrate the skin, allowing the active to gently soak into the skin throughout the night. Squalene is a skin-identical oil that glides effortlessly across the skin's natural barrier, providing your complexion with overnight hydration and helping integrate retinol into your skincare routine. As a water-free formulation, we've ensured the stability of the powerful yet fragile retinol molecule. How to use: After cleansing at night, apply 4 drops of C-Tetra Cream to your face, neck, and décolletage. Follow with your usual Medik8 moisturizer. We recommend Advanced Night Restore, designed to be used after vitamin A. It is advisable to patch test before use. Ingredients: Retinol The classic form of vitamin A helps boost collagen levels and improve your skin’s natural regeneration cycle, leaving it looking smooth, even, and youthful. Climbazole Climbazole is proven to enhance the activity of retinoids in the skin to deliver the potency of higher percentages without the irritation. Squalene Squalene, a natural emollient, helps restore your skin’s natural defense barrier and deeply hydrates the skin. Vitamin E Vitamin E, an oil-soluble antioxidant, can quench free radicals in the skin while stabilizing the retinol for optimal potency. NO ARTIFICIAL FRAGRANCES NO PARABENS SUITABLE FOR VEGANS ZIPPER FOUNDATION NO SYNTHETIC COLORS NO PHTHALATES ALCOHOL FREE NOT TESTED ON ANIMALS