Medik8 Crystal Retinal 1 is a stable retinal night serum. This gentle-strength vitamin A formula visibly improves skin texture and tone while minimizing irritation. Containing retinaldehyde, a next-generation form of vitamin A, it works faster than retinol. Its crystal encapsulation releases vitamin A gradually throughout the night. Hyaluronic acid and glycerin moisturize and hydrate skin. Achieve a smooth and supple complexion with this powerful serum.