Medik8 Crystal Retinal 3 firms skin while you sleep. This innovative serum contains retinaldehyde, a powerful form of vitamin A, to diminish the look of wrinkles and uneven texture. The encapsulated formula releases gradually, ensuring efficacy without irritation. Hyaluronic acid and glycerin work to hydrate, leaving skin visibly smoother and more supple. Achieve a youthful complexion with this advanced night serum.