This advanced formula combines the effectiveness of the two most potent non-prescription forms of Vitamin A available. It contains our exclusive bioactive Retinol and Retinaldehyde ULTRA-Reti™ Microparticles. Designed to support the skin's cell regeneration cycle, this ultimate anti-ageing serum helps to dramatically transform skin affected by mild to advanced photodamage, congestion and dullness to reveal a smoother, firmer and more luminous complexion. Suitable for skin that has been pre-conditioned by Ultimate Refining Serum.