Murad has perfected the science of retinol with this breakthrough serum, powered by Retinol Tri-Active Technology: a fast-acting retinoid, a time-release retinol and a retinol booster. Retinol Tri-Active Technology has up to 250% more renewal power than traditional retinol, yet is gentle enough for sensitive skin. This powerful yet gentle formula quickly and visibly reduces lines and deep wrinkles, firms, evens skin tone and boosts radiance for more vibrant, youthful-looking skin. Results: In 2 weeks, 93% experienced a reduction in lines and wrinkles and 93% experienced smoother skin.