Kiehl's Powerful-Strength Line-Reducing Eye-Brightening Concentrate has the following features: Creates brighter, younger-looking eyes with this effective line reducing eye treatment for. Features a potent concentration of Pure Vitamin C 10.5% that known for its affinity with skin and powerful ability to improve the appearance of aging skin. Infused with Haloxyl, it strengthens, soothes and brightens the eye area, helping to eliminate dark circles.