Medik8 Crystal Retinal 10 is a stable, gentle-strength vitamin A night serum. Created with retinaldehyde, a next-generation form of vitamin A, the serum works faster than retinol. A double-layered stabilization system ensures potency and optimum power while hyaluronic acid and glycerin moisturize and hydrate the skin. Regular use visibly improves the appearance of wrinkles, texture, and tone, leaving the complexion smooth and supple.