Science's two anti-aging top performers teaming up for more youthful-looking skin. We've combined Rovisome, a more effective and less abrasive form of retinol, with our efficacious Stay C (a stable form of vitamin C) _? proven to promote cellular turnover and create new cell growth. Kat's proprietary, nutrient dense KB5™ Complex, rich in antioxidants, is added to defend against environmental damage. Our best retinol serum leaves skin layers free to emerge with fewer visible signs of fine lines and wrinkles.