This supercharged serum is clinically proven to deliver instant luminosity and in 4 weeks, 100% of women had brighter, tighter skin. Experience the power of RoC® Vitamin C formulated with a 10% Vitamin C Blend bursting with potency. This lightweight serum gives fatigued skin the daily dose of RoC® Vitamin C it needs to maximize luminosity and reveal a visibly tighter, brighter and more even complexion.