This lightweight serum gives tired skin the daily dose of RoC® Vitamin C it needs to maximize radiance for even, glowing, smooth skin, with clinically proven results. It is formulated with a blend of 10% Vitamin C from RoC® that intensifies its potency. In 4 weeks, 100% of women achieved firmer, brighter skin. 94% achieved instant radiance and improved elasticity. 100% had brighter, firmer skin in 4 weeks. 0% cases of irritation. Format: 10.5ml